You can't cut Carr next year, so who can fix him?

Brian Johnson and Frank Smith are OC's in name only, Just like Bieniemy. It's McDaniels and Sirianni calling plays and designing the offense. They are not the ones really responsible for the success
Nick Sirianni isn’t the play caller in Philadelphia, it is Johnson. That being said, he isn’t very good and the offense, whilst obviously still functional, isn’t anywhere near as explosive as last season. Everything looks harder than it needs to be and it feels like the talent they have is overcoming poor play calling.