I can only just lol at that cocky mfer for getting ktfo while showboating. It doesn't take away from his legacy; he is the Fedor of his weight class, but he needed to be humbled. If he had the humility of Fedor, he could have went another few years of being undefeated and then retired. It's not that he got KOed.........it's the embarrassing way that it happened.
At age 38 I doubt very seriously he would have gone another 3 years without losing, eventually he would have come down one weight class or GSP would have stepped up.