I think Sanchez beats them all. The dude could in fight, counter, jab, plus he had some pretty good defense and great combination punching to go with heart.
Sal never fought at 130, but if he took all his strenghts he had at 126 up in weight, he beats all three.
Marquez, and Pacquiao. my (stupid) reason is, never got the chance to see sanchez, and prime morales.
Sanchez beats them all. Pac at 130 was not the fighter he is today. Sanchez's greater poise and technique wins out, but they'd all be pretty tasty fights.
I think if you take todays version of Manny and put him in the ring Sanchez still beats him. No telling what the guy would have become bc he was ATG at the time of his death or damn near close to it and thats at age 23!