I suspect Nagy has been saying this behind the scenes a lot as well. I think Halas Hall is not healthy with Pace pointing at Nagy's obvious flaws in developing Mitch and gameplans and playcalling, and Nagy is pointing at Mitch saying he can't take the next step and is handcuffing him from what he wants to do. Problem is Pace is literally the one that brought both in to work together so Pace has absolutely no leg to stand on (even if Nagy has very little as well).
One might be tempted to say last year is last year and we are moving on, but I suspect it doesn't work out like that. And while the offseason might be one long and relatively peaceful cease-fire, losses will bring it all up again. Maybe even WINS where Mitch looks bad still.
EDIT: In before I am accused of speculation. Of course I am speculating. It could be possible that Pace, Nagy and Mitch all get on the same page and all bounce back in elite form. If anyone anywhere believed that, that's fine. I don't see how it could be justified but fine. And equally as speculative as mine, probably more so.