There's a golden rule in football: never replace a legend. Perkins couldn't replace Bear Bryant, in fact nobody has except for Gene Stallings. It took almost 30 years for Ohio State to find a replacement for Woody Hayes. Ron Zook never had a chance at Florida trying to fill Darth Visor's shoes. He could have won the SEC every year he was the their, and he still wouldn't have been good enough.
Les Miles wasn't considered good enough to replace Nick Saban at LSU until that bastard stabbed us and Miami in the back by signing with Alabama. Now, Les is the most popular guy in town...
Les isn't popular in Stillwater. Saban isn't the only back stabber.