Former Eagles defensive coordinator Jonathan Gannon can attest to that.

Source: https://larrybrownsports.com/football/jonathan-gannon-throws-shade-at-eagles-media-fans/614252

"So, every time I hear an answer about Jonathan Gannon I laugh to myself.

Source: https://www.foxsports.com/stories/nfl/eagles-could-lose-secret-sauce-with-both-coordinators-in-high-demand

The longtime New England assistant will be a “name to watch” for Houston’s OC position if the Texans hire current Philadelphia Eagles defensive coordinator Jonathan Gannon as their next head coach, ESPN’s Dan Graziano reported Wednesday.

Source: https://nesn.com/2023/01/patriots-assistant-rumored-as-coordinator-candidate-for-this-team/

We’re pretty sure C.J. Gardner-Johnson won’t be playing for Jonathan Gannon and the Arizona Cardinals anytime soon.

Source: https://arrowheadaddict.com/2023/03/01/c-j-gardner-johnson-criticizes-former-coach-super-bowl-plan-vs-chiefs/

When a new coach is hired they usually bring a handful of former players with them, so that gives Jonathan Gannon and Shane Steichen a leg up on Doug Pederson and Frank Reich.

Source: https://www.bleedinggreennation.com/2023/3/12/23636371/philadelphia-eagles-free-agency-mailbag-compensatory-draft-picks-nfl-news-darius-slay-trade-rumors