All 4 have something in common...they develop talent. They have all had impressive records at schools with limited success...none have ever had knock your socks off recruiting...Kelly oit of that group cheated to have recruiting success. We would be no better off at this point with the other 3. We would be in the same situation.
Frost and Norvell have never coached at a Power 5 conference so we don't know how they would do. See, Jim McElwain.
Kelly has proven that he can develop talent AND that he can win at Power 5 conferences. The problem is, he's also proven that he will leave for any job West of the Rockies.
Mullen was clearly the best candidate of this group. Not even close.