All of the above, but imo the primary issues have always been with training, the assistants, and TNT's inability to strategize during matches.
Training - They refuse to acknowledge that scrambling and wrestling from all positions are now essential components of modern training. It’s clear that no one on staff has the expertise to teach how to properly finish a shot.
Assistants – They tend to retain only yes-men and refuse to go outside the program. When they've brought in someone outside the program, those individuals rarely last long.. coincidence?