The thing is Hatton was in a similar position to Pacquaio and everyone said he could beat PBF, and Hatton is another very good pressure fighter who is not quite the athlete Pacquaio is, but is better schooled, and his defense was suspect when he fought Collazo and he had troubles. I think Casamayor would Pacquaio a hell of a fight. I mean Pacquaio for his last few ko's has worn down his opponents, and hasn't shown one punch ko power really lately (Third fight against Morrales like I said earlier was not a devastating ko, but Erik decided not to stand up... he even gave a knowing wink to his corner though I don't think the fight was rigged he knew he was outgunned and didn't want to get brutalized). Anyways Casamayor is very skilled, a good puncher with speed, and only 5 pounds north of Pacquaio. Guzman like Valero are good opponents to raise Pacquaio's stock more, but they may not be ready for him nor may they be the right opponents for him. Pacquaio is pretty big at 130, and I could easily see him going up to 140 if he wanted to, and then he could fight Corrales, Castillo, Hatton though I think they would all beat him because they too big. The thing I see is Mayweather can go up and down weightclasses even as he gets older due to skill while I don't think Pacquaio will be able to fight much bigger because as good as he is. He realizes on his power to save him, and thats why he isn't as good as PBF or Winky IMO.