To further this point:
Bama DC Kirby Smart - His most impressive position was being the safeties coach for the Dolphins. The year before that he was a RUNNING BACKS coach at UGA.
Bama OC Jim McElwain - Hired after a one year stint at Fresno State, in which the offense was good, but not spectacular. This would be the equivalent of hiring Tommy Spangler.
LSU OC Steve Kragthorpe (who was originally the OC but stepped down to QB coach after he was diagnosed with Parkinson's) - Was an absolute failure as a head coach at Louisville and left the program in shambles. This after he was labeled a can't miss coaching prospect while coaching at Tulsa.
UF DC Dan Quinn - Was the defensive line coach for the Seahawks before taking the UF job. Sunseri was the DL coach for the Panthers. What a huge difference.
Oklahoma State OC Todd Monken - WR coach for the Jaguars (really?) before taking the job last February. He had the best offense in the country this season.
Georgia DC Todd Grantham - Was the DL coach for the Cowboys.
I don't think anyone would argue that Smart, Quinn, Monken, and Grantham haven't worked out for their teams. Sunseri has coached at the NFL level and been a successful assistant in college.