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Advanced Defensive Stats: S and LB Pass Coverage

| June 30th, 2021

Let’s continue our quick tour of Chicago’s defense by honing in on pass coverage.

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At a surface glance, Chicago’s pass defense was just about the definition of average in 2020. They gave up 64% completion (14th in the NFL), 7.2 yards/attempt (16th), 28 touchdowns (16th),  had10 interceptions (23rd), and allowed a passer rating against of 94.9 (20th). They were 21st in Pro Football Reference’s Adjusted Net Yards/Attempt, which accounts for sacks, touchdowns, interceptions, and yards, and 13th in Football Outsider’s pass DVOA rankings, which is intended to be a one-stop measure of pass defense overall.

A closer look at advanced statistics from Next Gen Stats shows how QBs playing against the Bears played relative to the rest of their games and the NFL average.



A few thoughts:

  • Opposing QBs generally didn’t see any change against the Bears in terms of how long they held the ball before throwing it. This means that Chicago’s pass rush wasn’t forcing them to get rid of the ball quickly, but also didn’t let them hang onto it forever. Again: average.
  • In terms of where QBs threw the ball against Chicago, opposing QBs typically threw it slightly deeper against the Bears than other opponents, though the difference is pretty subtle (for context, individual QBs ranged from 5 to 11 yards for average pass depth). That small difference was completely eliminated when looking at average completion depth.
  • Opposing QBs also threw into tight coverage (aggressive throws) slightly more than normal against the Bears, though again that’s not a huge difference. For a little context, individual QBs on the year ranged from averaging 11% to 22% on aggressive throws.

Now that we’ve firmly established the overall pass defense was around average, let’s look at how individual players fared in coverage last year to see where Chicago might have strong and weak spots. We’ll go position by position, using advanced data from Pro Football Reference.

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Bears Must Address Imbalanced Roster Construction

| November 20th, 2020


Yet again in 2020, we see that the Bears have one of the best defenses in the NF,L coupled with one of the worst offenses. This combines to give them a team that is not good enough. It’s Groundhog Day all over again, a continuation of 2018-19, all of the Lovie years, and the 1980s after Jim McMahon got hurt.

Normally I’d use the bye week to do an in-depth look at the numbers for Chicago’s offense and defense, but honestly I don’t see the point. Their defense is really good, their offense is really bad, and you don’t need advanced stats to tell you more than that. I’m sure I’ll still do some of that analysis in the offseason but for right now I want to focus on a bigger question: WHY is the defense so much better than their offense?

The answer here is really not that surprising: the Bears are investing more in the defense. The table below shows how much money they have invested in the defense compared to the offense, as measured in 3 ways:

  • 2020 cap dollars. How much current money is being spent.
  • Average yearly salary. This accounts for the fact that contracts don’t have even distribution of cap hits every year. For instance, Robert Quinn has an average salary of $14M per year in his contract, but only has a 2020 cap hit of $6M. This will give a better picture of true spending.
  • % of salary. This looks at how much of your total spending is focused on one side of the ball, based on the average annual salary of players. It’s a good measure of how lopsided your investment is on offense vs. defense.

The table below shows the Bears’ values for offense and defense in each category, as well as the NFL average and where the Bears rank. All data is from Spotrac.

A few thoughts:

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The Five Plays that Defined the Regular Season for the 2018 Chicago Bears

| January 2nd, 2019

Usually I write a paragraph here, introducing the concept below. But doesn’t the headline do all that work? Do you really need further explanation of this piece? I don’t think you do. So read away…


(#5) Kyle Fuller’s Dropped Interception

Yes, this was a negative play. But it is the singular moment of adversity that seems to have inspired the entirety of the 2018 campaign. Every big play, every dance routine, every sack of the quarterback, seems to have been motivated by that Aaron Rodgers pass sailing off the chest of Fuller.


(#4) All Those Touchdown Passes Against the Bucs (tie)

After three games, 2018 felt like it was going to be a long, developmental-type season for Mitch Trubisky. Then Week 4 happened. 354 yards. 6 touchdowns. Yes, it was against the hapless Buccaneers but it was still the kind of explosive performance this organization was not using to seeing from the quarterback position. Seeing it was important for Bears fans, Bears players/coaches and for the quarterback himself. That game elevated expectations for the entire year.


(#3) Akiem Hicks Scores a Touchdown

Week 13, in the Meadowlands, Daniel handed the ball to Hicks at the goal line and the behemoth scored (easily). It was the play that best symbolized the sense of pure fun Matt Nagy has brought to this organization. He’s not afraid of comparisons to the ’85 edition of this franchise. Fridge be damned! He’s just out there calling plays, having a good time and inspiring his players to do the same.

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Short-Handed Bears Beat Lions, Cement Lead Atop NFC North

| November 23rd, 2018

Not the most compelling game ever played but the kind of result good teams get. The Bears played three division games in twelve days and went 3-0, outscoring the Lions (twice) and Vikings 82-58.

This three-game stretch solidified them as one of the better teams in the NFC and it would now be a terrible disappointment if there was not a football game at Soldier Field in January. 

Rapid fire…


  • Chase Daniel did everything a team can ask from their backup quarterback. He moved the offense. He avoided crippling errors. Was he good? Not really. Even the touchdowns/big plays were not well-thrown balls. But he got the job done. In the modern NFL, teams need a backup QB that can hold down the fort and win some games for 2-3 weeks every season. With Daniel, the Bears have that.
  • 3rd and 1. Early second quarter. Stafford rolled to his left and had about six minutes to find an open receiver to move the chains. Why? Khalil Mack was floating in coverage. (And “floating” is the accurate word.) This is what Fangio’s defense is. Understood. But without a healthy Aaron Lynch, and with Leonard Floyd struggling to get to the quarterback, not allowing the game’s best edge rusher to rush from the edge feels negligent.
  • As Andrew pointed out on Twitter, the Bears were awful on 2nd and long all game, giving up chunk plays in the air and on the ground. This will be a focal point before they head to the Meadowlands.
  • Eddie Jackson has to be in the conversation now for DPOY now. Right now the award is Aaron Donald’s to lose, mostly because of Mack’s earlier injuries, but no defender has made more big plays in 2018 than Jackson.
  • Every week Roquan Smith makes another play. And every week it becomes more apparent Smith is going to be in the middle of the Bears defense for a long, long time.
  • The running game, or lack thereof, will be a major talking point over the next ten days. But look no further than Matt Nagy’s two-point conversion call to understand why that element is struggling. With an inaccurate backup QB, Nagy called a pass. And not just a pass. A quick, bubble screen that required timing and pinpoint ball placement. Despite what the head coach tells reporters, the answer is simple. The Bears don’t run the ball because the Bears don’t want to run the ball.
  • Taquan Mizzell is more valuable to Nagy than Jordan Howard.

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Bears Take Care of Business, Throttle Undermanned Bills

| November 5th, 2018

Strange game. From the moment Eddie Jackson returned a Roquan Smith-forced fumble for a touchdown with 7:07 remaining in the first half, the entire building knew the game was over. Here are six specific, in-building thoughts from Bears 41, Bills 9.


(1) That was one of the loudest stadiums I’ve ever heard to start the game. The crowd noise was absolutely deafening when the Bears had the ball for the first quarter plus. The false starts upfront were completely understandable. Offensive line miscommunication should have been expected. (I could barely hear a friend two seats away from me.) There is no chance a Soldier Field crowd, with the team at 2-6 and starting a dead weight quarterback, would be anywhere near that enthused at kickoff. Impressive showing from Bills fans, in and around the ballpark.


(2) Good to see Jordan Howard running with some anger. Again, don’t look at the overall numbers. They’re mostly meaningless in a game like this. But Matt Nagy is finally starting to understand how to use Howard, especially down in the red zone. The Andy Reid offense like to throw to score. The Bears are built to ride Howard into the end zone.


(3) Two defenders stood out to me: Roquan Smith and Eddie Jackson. Smith is going to be a star in the league for a long, long time but that is expected from a top draft pick. Jackson is an incredible player. He closes on the football as good as any Bears safety since Mike Brown. He’s the rare back end guy comfortable with the football in the air and tackling in the open field. He’s got great, natural instincts.


(4) The Bears were clearly uncomfortable with the amount of running Mitch Trubisky did against the Jets last week because there were times Sunday Trubisky had acres of space in front of him. If this WAS a coaching decision, I applaud it. Trubisky knows he can run. That’ll be there as long as his legs are. But this season has to be more about processing information, stepping into the pocket and delivering the football. And in a game like Sunday’s there’s no reason for the young quarterback to take any unnecessary punishment.

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Turning Chicago’s Fortunes Around Will Require Turning Over Opposing Quarterbacks Through the Air

| August 6th, 2018

Chicago returns their entire secondary from last season, which is good news.

Off-season additions like Eddie Jackson and Prince Amukamara, coupled with breakout seasons from Kyle Fuller and Adrian Amos, helped construct a quality 2017 pass defense. The Bears were 7th in passing yards allowed, 15th in yards per attempt, and 5th in fewest touchdown passes given up.

But there is one area where improvement is desperately needed: interceptions. The Bears caught only 8 for the third year in a row in 2017. Only two NFL teams had fewer.

This has to change if the Bears want to become a good team. To understand why, let’s look at how important turnovers are to winning football games.


Turnovers & Winning Games

Over the last five years, there is a correlation of 0.50 between a team’s turnover differential and the number of wins for a given season. That means that roughly half of a team’s season outcome can be explained simply by looking at how many times their offense turned the ball over compared to how many times their defense took the ball away. Other studies have looked at this in greater detail and found the correlation to be somewhere between 40% and 65%.

I wanted to put this into a visual that’s a bit more concrete, so the table below shows how a team’s turnover differential corresponds to various season outcomes over the last 5 seasons (full data available here).

Teams that have a better turnover differential win more games and make the playoffs more often. It’s not a revolutionary idea, but I think it’s helpful to see some numbers.


Fumble Luck Doesn’t Last

So if the Bears want to improve, they need to improve their turnover differential. They actually weren’t awful last year (as I predicted before the season), as they had a differential of 0 by turning it over 22 times and forcing 22 turnovers, but that was with a hyper-conservative offense designed to limit turnovers.

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Data Entry: Establishing Ryan Pace’s draft profile, day 3

| April 17th, 2018

The last in a three-part series, breaking down Ryan Pace’s approach to the NFL Draft when it comes to prospects. Today, day three, rounds four through seven.


Draft History

2015: RB Jeremy Langford (R4), S Adrian Amos (R5), T Tayo Fabuluje (R6)

2016: LB Nick Kwiatkoski (R4), S Deon Bush (R4), CB Deiondre’ Hall (R4), RB Jordan Howard (R5), S DeAndre Houston-Carson (R6), WR Daniel Braverman (R7)

2017: S Eddie Jackson (R4), RB Tarik Cohen (R4), OL Jordan Morgan (R5)


Trend 1

Prioritize Rounds 4-5

Under Ryan Pace, the Bears are averaging two round 4 picks per year and are currently slated to have two in 2018. They will potentially have more if Pace trades down in round 2 again, as is he wont.

The Bears also acquired a fifth round pick in the Brandon Marshall deal. These are the rounds where he likes to operate, and he has done quite well, landing five solid contributors in three years: Adrian Amos, Nick Kwiatkoski, Jordan Howard, Eddie Jackson, Tarik Cohen.

On the flip side, Pace doesn’t seem to care much about round 6 or 7, where he has made only three picks total through three years. He’s made several trades sending these picks out.

  • 6th for Khari Lee
  • Throw-ins for a trade on day two that netted extra 4ths
  • 6th to move up for Kwiatkoski
  • Throw-in 7th to get 5th back when trading Brandon Marshall to Jets
  • Conditional 2018 7th for Inman that they kept in 2018.

Don’t be surprised to see one of those traded away, perhaps to help move up for a coveted player in round 4.

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Data Entry: Random Roster Thoughts

| April 6th, 2018

Note: thanks to Butch for the cool new header picture

Free agency is settling down, so now is a good time to take a look at where the Bears’ roster currently stands. This will give us a better idea of what minor free agency moves should still be made and where the draft attention should focus for the first few rounds.

Let’s start with a rough depth chart, followed by a few quick thoughts. This is just my estimate of what a depth chart could look like, don’t read too much into details like Roy Robertson-Harris being above Jonathan Bullard, or anything like that.

Reflections, in no particular order:

  • The Bears currently have 65 players under contract. They’re scheduled for 7 draft picks, and will likely sign a few more cheap veterans, but there’s going to be plenty of room to fill out the roster with undrafted free agents after the draft. Expect them to bring in at least 15 of them, and thus it’s no surprise that they’ve been meeting with several players projected as possible UDFA targets, including Jonah Trinnaman and Jarvion Franklin.

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Data Responds: Bears at Vikings

| December 31st, 2017

Sorry for the break the last few weeks. I haven’t been able to watch games live due to various holiday scheduling hijinks. Darn that real life for getting in the way!

Before we get into today’s game specifically, reports are that John Fox will be fired today. I won’t miss you as Chicago’s head coach.

In general, this game looked very much like a disinterested team playing out the string on the road for a soon-to-be-fired coaching staff against a hungry opponent playing to lock up a first round bye.

Offense

  • The Bears got the ball to start and opened with a heavy set Jordan Howard run into a stacked box for no gain. On their 2nd drive, they followed that up with a Jordan Howard run into a stacked box for -4 yards. Shockingly, both drives ended in 3 and outs. Oh how I am not going to miss that.
  • On Chicago’s 3rd drive, they threw the ball on 1st down! You’ll be surprised to find out that not being incredibly predictable actually worked. Of course, the Bears followed that up with a FB dive into a 9 man box on 3rd and 1 (why is Michael Burton still a thing?), which lost yardage and forced a punt. Before they could get the punt off, the Bears took a delay of game penalty, because of course.
  • Rookie QB Mitchell Trubisky had a bad rookie moment that resulted in a safety. Under pressure, he kept backing up until he was in the end zone, which was the mistake. He then threw the ball away to pick up an intentional grounding penalty, which is a safety in the end zone. My complaint is not with the grounding, but with the fact that he backed up into the end zone first. He could have taken the sack at the 3 yard line, and needs to know the field position situation there.
  • Trubisky also had a terrible throw in the fourth quarter where he missed a wide-open Dontrelle Inman because his feet were not properly set. Despite a clean pocket, he did something weird where he torqued his upper body, which caused him to put the ball far too wide and out of bounds. Those mechanical issues, and the corresponding accuracy concerns, have been a repeated problem this offseason, and are the #1 thing Trubisky needs to work on this offseason.

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