The previous head coaching experiences, as you mentioned. Also, I think Weis lacked the personality to be a top-flight head coach. I think he originally had envisioned Cutcliffe as a sort of go-between between himself and the coaching staff, which would have allowed Weis more of a CEO type role.

Without Cutcliffe, he was forced into more of a hands-on role, and I don't think he was prepared for it.