Where do you even get this? Gannon repeatedly stated that he let his coordinators calls their plays and run their system. I'm supposed to believe that Gannon hired a guy who worked for him in Philly to run his defense and they weren't aligned in how it should be run?
Yeah, there's a difference between calling the plays in the game, and the scheme that they run and the game plan that they set up.
You think a defensive HC is going to let Rallis run anything other than a defense set up with his principles?