Why fire Barwis? It seems Hoke is intent on doing a complete housecleaning like RR did. Why not retain someone that seems to be one of the best, that brought Michigan up to date? It would seem you would like some continuity for the players. Offense and defense schemes will change completely (again). We expect all of the defensive coaches to be gone all of the offensive coaches gone (except maybe Fred Jackson). Ex players seemed to hold Barwis in high regard and he would seem to have relationships with all of the players that might aid in retention. He seemed to be good for recruiting.
It bugged me when RR fired everyone last time rather than trying to keep some staff to serve as a bridge (in hindsight keeping the defensive staff would have been a good idea). S&C coach would seem like the least risky (from a scheme standpoint) to retain.