One of the tough things about the Nick Sirianni era in Philadelphia as the Eagles' head coach is that his success has led many coaches to leave the team.
Sirianni has had three coordinators in his five years as an NFL head coach: the Indianapolis Colts' Shane Steichen, the New Orleans Saints' Kellen Moore, and now the former Arizona Cardinals' Jonathan Gannon. This has led to a lot of turnover within the coaching staff, but more could happen below the coordinator level.
The Athletic's Zach Berman warned Eagles fans that the defensive staff built by defensive coordinator Vic Fangio might get some looks for coordinator jobs, including defensive line coach Clint Hurtt, defensive backs coach Christian Parker, and linebackers coach Bobby King.