I actually agree with GSP...this ruined Roy Jones Jr IMO. http://www.espn.co.uk/ufc/sport/story/86858.htmlGeorges St-Pierre has used the example of Roy Jones Jnr. to explain why he may never gamble on moving up to the UFC middleweight division.
St-Pierre cites Jones Jnr. as an example of how playing around with body weight can disturb a career. Jones dominated the boxing terrain at light-heavyweight, winning 13 straight fights, before stepping up to win the WBA heavyweight belt. However, after dropping back down to light-heavyweight, Jones initially won before losing three on the bounce, and he was never the same fighter again.
"Right now, I am a 170-pounder," St. Pierre said. "If I were to fight at 185 pounds, it would be a complete reorientation of my career.
"We've seen in the past with boxers like Roy Jones Jnr. In my opinion, what ended Roy Jones' career-winning streak was when he went up in weight and tried to go back down. It's not the fact that he went up; it's when he tried to go back down that messed him up.
"For me, it's a good example because Roy Jones was known as one of the best of all time before he started losing. It makes me think twice sometimes [about changing] weight; it's not really going up that hurts you, sometimes it's to go [back] down."