Pacquiao burst onto the p4p scene at age 25 when he upset and annihilated MAB. In an incredible display of aerobic capacity, speed and chin. Essentially walking right through and physically overwhelming a dominant fighter. Then years later at age 30 he upset a much larger (albeit less dominant champ than Barrera) and still very young and game Cotto. Using more savvy at this point, but having shown to that point very little discernable loss in workrate or speed. Power obviously not nearly as devastating at this weight though. Really tough choice.