I don't see size playing much of a role here. Bradley beat Abregu at 147. Abregu hasn't lost since. However, Bradley right now in all likelihood is best at 140, but maybe Pacquiao is too, to be fair. In any event, Pacquiao isn't a big welterweight, really more of a junior welterweight, or in between junior and welter. Power will play a role in that Bradley didn't have power at 140, how will he have power at 147? On the other hand, I believe Bradley will be able to handle Manny's power because he has handled the power of big punchers before. Kendall Holt has a monster left hook, and it literally lifts Bradley off the ground at 4:45 of the video below. Bradley's recuperation powers are second to none. Bradley's footwork and defense are highly underrated + he's a good on the inside. He's undefeated for a reason. Bradley needs to keep Pacquiao out of the middle of the ring. Fight on the inside when he can and smother when Pacquiao starts to unload on the outside. War Desert Storm!
Bookmarks