In terms of his current legacy, how much would it do? That is, based on where you, personally, rank him, how much would he move up? Would you consider it his "biggest" win--- and biggest possible, supposing Mayweather is completely out of the picture?
He is now the Best in Boxing History. Then if that happens....... He will be more than the BEST EVER in boxing history.
What if Ward fought Vladimir Klitschko? Pac should be fighting Void, if he still can't get Void into a ring he should fight Berto, Bradley, etc.
I dont think Pacquiao would lose anything even if Martinez were to KO him at 154 and if it were at 160 Pacquiao would get credit for stepping up. It would show his heart and determination. Win or lose.
Even if he lost by early KO (hypothetically speaking), he'd still deserve a hell of a lot of credit for giving it a shot. But if he won?? That would be a HUGE feather in his already decorated cap; I'd say top 10-15 greatest ever if he fought and beat Sergio NEXT. Maravilla ain't exactly unbeatable. He has a lot of flaws that the right fighter could exploit. We won't be seeing this fight anytime soon, if ever.
Of course not, Pacroid had his best work at the lower weights, north of 135 he has fought damaged and drained fighters coming off devastating loses, that has serve him well cause his wallet got fatter but in no way make him an ATG, he was already there by fighting Morales, Barrera and Marquez, all this catch weight and choosing to fight the Cottos, Margs and Mosley the way he did and doing doesn't add to his legacy, on top of that you throw in the random test and doesn't look good, only *******s will brush those things off.