I know Bill is not himself and well past his prime, but I'm not even sure what made him great as an NFL coach would translate to CFB. He was so good with moneyballing roster depth*. I don't think those same opportunities exist in college. The top dogs don't have depth problems at all, so there is no edge there where he can outsmart them.
The NFL is a league where you can succeed if you are great at very specific things. A well-rounded guy who is not great at anything is not really what people are looking for in the NFL, but that guy is a great player in college. It's a different sport for somebody like BB (not necessarily all coaches).
*For example, he figured out that DT's had more relative value than DE's (because of salary). He always sacrificed talent at the top for depth so he got to the playoffs without major holes year after year after year.