Johnson runs successful offense largely because of TOP, Pro Bowl talent throughout . Monken has success with average players plus some Pro Bowl caliber players. How he will perform as HC is unknown.
I've paid attention, and some of that is players, and some of it is scheme.
Way I see it?
Caleb (under Johnson) > Goff
DJ Moore = Amon Ra St Brown
Kmet = La Porta
Odunze = Williams
Swift = Well, Swift. He was there for Johnson's first year.
Even if you want to tell me that the Bears roster isn't as good as the Lions, the point is in terms of skills and abilities, the Bears already have the pieces they need at the skill positions to run what Ben wants to run. They just need to fix the offensive line and they can hit the ground running, and there is no place in a skill position where the Bears have a player who CAN'T do what Ben would need them to do in this offense.
Other than the line, it's pretty plug and play with the current personnel. Probably need another RB to fill the role Monty does but that's it.
That said, I agree that how he will perform as a HC is indeed unknown.