I have spoken to Butch personally before all of this. The guy is dying to come back to Miami.
He's a different guy now. He's older, a cancer survivor, and has a different perspective on life as all of us do as we get older at any stage of life.
I don't know what he currently capable of. What I do know is that he's the best evaluator of talent I have ever seen, has plenty of coaching connections, and would take this job the microsecond it was offered.
As to how he left, there are two sides to every story. I think most only saw or heard one side. There's another. Regardless, the truth is probably somewhere in the middle and water under the bridge from my vantage point.
I would interview Chud, Butch, Petrino, and Schiano. Pick one and move on.