it's more than just playcalling - it's an overall approach to the game.
Fleck believes he has a system that works. and it has worked at times when the offense and defense are able to compliment each other.
but when the offense or defense - or both of them - struggle, then the system doesn't work - and Fleck shows no willingness to change, adjust or adapt.
that's the real issue - a coach who either can't or won't change when things don't go the way he would prefer. Sure, more talent would help. but even with more talent, you have the same coach with the same inflexible philosophy.