I think going up in weight actually helps the fast puncher types. If you look at guys like Roy Joens Jr who when he went up to LHW, he could still hit hard enough to hurt his opponents, but his speed was way too much for them. I think defensive guys like Mayweather it doesn't help that much because he doesn't overwhelm opponents with his speed unless they are people like Arturo Gatti. In Pacquiao's case, a guy who hits hard and uses his speed so well, the slower his opponents the less he gets hit, definitely the better for him.