Fans question decisions, calls, etc but most of them don’t know much of anything or have any baseline for the decisions. Coaches make mistakes, lots of them. Dabo, Saban, Meyer included.
Where Kelly faulted was really two different areas:
1. His lack of recruiting effort. Not only was he lazy, but that trickles down to your staff. Kelly had a belief that he could get good enough guys, develop them, and then out scheme. That’s not how it works if you want titles. This could be a separate category, but this includes the QB position which was the Achilles heel of the era.
2. His loyalty to assistant coaches. He kept his guys too close, didn’t like to bring in outside guys and when he did it was obvious they had to spend more time adapting to Kelly’s way than bringing in their new/fresh ideas. This is the area Saban excels, which is they the game hasn’t passed “him” by.