Oscar was boxing 12 rounds fine in the gym, I don't think it was stamina, he just couldn't catch Pacquiao, people said he had no snap on his punches, but Pacquiao never let him find the range, hence Oscar was only throwing range finders against Manny. Mayweather made the mistake of getting caught on the ropes, and not using enough movement against Oscar, but Manny didn't.

IMO I think Mosley is a harder opponent for Pacquiao than Cotto. IMO I don't see Cotto being able to catch Pacquiao in a big ring. Timing is important, but as good as Cotto's timing is, his footspeed and his timing aren't comparable to JMM, like we saw with Oscar I think Pacquiao could get in and out before Cotto would be able to react, Judah never used enough footwork, or that fight would have been a lot tougher for Cotto because Judah should have throw the left cross and uppercut all night, but he didn't, nor did he set them up at all.