I never bought the "he burned his bridges here" stuff. Mario is not stupid. He's always been a very slick operator. I feel pretty confident that Mario bolted to Bama but smoothed it out well before he did. UM gave him a phony position just because of his local ties and recruiting ability. The Bama position was a real coaching position, and making a half million dollars a year. Probably substantially more than UM was going to pay him in that made up administrative role they gave him.
He's not stupid. And after Golden is gone, Donna S will be gone, and Blake James could very well be also. So who would even really be left to hold a grudge against Mario for taking a better gig, even IF it had rubbed some people the wrong way.
I just don't think the damage is as bad as most suspect, and seeing how he has operated over the years, Im of the belief that he probably smoothed things over and left under decent terms.