Originally Posted by Dedication
Every top fighter KO'd aged over thirty after many years in the game. Never returns to championship level.
Robert Duran beating Davey Moore and Iran Barkley for titles at 154 and 160 after being brutally KO'd in his 30s.
Lennox Lewis stopping Hasim Rahman, Mike Tyson, and Vitali Klitschko to end his career after the embarrassing Rahman knockout loss.
Archie Moore beating Willie Pastrano, Nino Valdes, Bobo Olson, Joey Maxim, Jimmy Bivins, Yvon Durelle, Bob Satterfield, and murderer's row Bert Lytell after suffering a number of KO losses in his 30s.
...it can be done and solid returns have happened. That said, I'm not so sure Pacquiao will be one of them. So I'd tend to agree that he'll never be the same. His style is so dependent on physical gifts (footspeed, handspeed, raw explosiveness). One bad KO loss can send a fighter like that on a downward spiral if it physiologically causes them to lose a step or two and makes it neurologically easier for opponents to disconnect them from their senses.