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. There might be a solution to keeping the coaching staff in place, though, according to Berman.
"With defensive coordinator jobs opening around the league, pay close attention to the Eagles' coaching staff. They were able to keep the staff intact last year. My guess is that it will be harder to accomplish this year."
"One factor is also how deep the Eagles go in the postseason. A run into February makes defections less likely, in a twisted way."
Eagles might be able to delay the inevitable by winning
Philly saw the same thing last year: they went on a deep playoff run to win the Super Bowl and didn't lose many coaches in the process. The biggest name, though, was offensive coordinator Kellen Moore, who went on to be the Saints' head coach.
After the struggles of the offense this season, don't expect any to get offensive coordinator roles. In fact, expect some deductions that could include the current offensive coordinator, Kevin Patullo.
The turnaround of the defense from the start of the season is going to be a big reason that NFL teams might poach those assistant coaches away. Between Hurtt, Parker, and King, at least one might be heading elsewhere for a defensive coordinator job.
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It would be unfortunate for the Eagles to lose coaches, especially with the defense playing so well, but similar to how assistant general manager Alec Halaby is potentially interviewing for the Miami Dolphins' GM job. This is the price the Eagles have had to pay for their success over the last few years in the NFL.