The military knows you can only stay with the same leadership for so long, then it goes stale.
Good companies know this as well.
Does that dynamic fit the NFL?
I'm not sure; but it sure seems so.
McCarthy didn't forget how to coach. This is the same Superbowl and 8 playoff seasons HC.
Sometimes I think an HC can just grow stale and players stop listening. Or, he has spent so long establishing and then maintaining certain systems that he doesn't want to change them. Or loyalty to certain assistants has taken priority over the need to change some things.....things those assistants can't do.