Ahead of the start of free agency, Insider is providing buyer's guides for all 32 teams: biggest need positions from Football Outsiders, top targets from Matt Williamson and predictions on how everything will play out from our NFL Nation team reporters.
Included below are links to every team's article. This is the entry for the Chicago Bears.
Defensive line: The Bears' problems on defense start up front. A season after finishing 32nd in adjusted line yards (which measures a defense's control of the line of scrimmage), the Bears improved ... all the way to 30th. They ranked 29th or worse in runs marked left tackle, middle/guard and right tackle. Vic Fangio brings his 3-4 defense, and a good nose tackle should be a priority.