I like Josh Gattis and what he came to Michigan to do. The problem is, when you work for an offensive guy, you never really know if it was him or Jimmy running the offense. You don't have to be an insider to see that Michigan was running Jimmy's offense last season. That offense won Josh the Broyles Award for the top assistant coach in the country.
That is a bit counterintuitive isn't. It's sort of like the DC for Alabama, is it the DC or Saban running the defense. We know the answer to that.
A college football coach has to be two things: 1 - a great coach that can call plays/make adjustments and develop talent and 2- a strong recruiter.