The Bears have made a number of moves in free agency, and I want to use some advanced statistics to weigh in on their likely role on the roster and value to the team. We looked at the offense yesterday, and now will move to the defense, where the Bears will be replacing two starters.
Nickelback Bryce Callahan followed Vic Fangio to the Broncos, and the Bears replaced him with Buster Skrine, who was a bit cheaper ($5.5 million/year vs. $7 million/year) and has been a bit healthier (5 games missed vs. 12 games missed in last 3 years). According to The Quant Edge, both players have spent the majority of their time over the last three years at nickel, though Skrine has spent a bit more (roughly 30%, compared to 15%) playing outside.
The table below uses data from The Quant Edge to show how effective each player has been in coverage. In order to increase sample sizes, I looked at Skrine and Callahan cumulatively from 2016-18 (I’ll note this actually helped Callahan and hurt Skrine, lest I be accused of trying to skew the numbers in the Bears’ favor), and for context compared them to averaged 2018 stats from five other nickelbacks who are widely viewed as being quality players: Chris Harris, Aaron Colvin, Tavon Young, Nickell Robey-Coleman, and Justin Coleman.
Based on this data, it is pretty clear to see that Skrine is a downgrade from Callahan, but that is not to say he’s a bad player. Skrine gets targeted more frequently than other nickel CBs, but holds up to the targeting quite well. The only thing that really jumps out poorly there is the TD:INT ratio. Like Callahan, Skrine doesn’t really get many interceptions, and he has given up more scores than you would like to see.