Chuck Pagano stood behind a set of white barrels Wednesday at Halas Hall. The unit that led the NFL in scoring defense and takeaways in 2018 — nearly intact — was in front of him.

Methodically during Wednesday’s OTA at Halas Hall, they went through plays with linebackers filling gaps. The new Bears defensive coordinator offered coaching points and made tweaks during the installation period. Linemen were repositioned. Helmets were off as the players zeroed in on Pagano’s instruction.