would we have revised history and said "GSP was out of his prime, when he lost to Matt Serra?" According to some MMA fans, when a great fighter losses, that means he or she is "out of their prime." Fortunately, GSP kept on fighting and proved that a great fighter can lose motivation to prepare properly, and begin to take opponents lightly. However, it doesn't necessarily make them "out of prime." They are not at their best, but the potential is still there. Two different concepts. So, Matt Serra didn't beat the best GSP, on that night, but he still beat GSP in his prime.