The second best weight jumper would be Sam Langford. If you want to change the thread title, you can do that - click on edit, then advanced.
How about putting Georges Carpentier on the list? Fought as light as featherweight, and was a pretty slick heavyweight.
On paper Carpentier is a good choice, though as a fighter he was overrated given his lack of strong opposition. Barbados Joe is obviously a great choice, given the fact that he more or less jumped weight classes without changing much himself. A 5'1 Welterweight fighting with success up to HW, KO'ing some of the best HW's of the era.
For their success through the weights, how would you rate these fighters against each other? Duran, Armstrong, Walcott, Ted Lewis, and Charles.
What ? A former lightweight beating a heavyweight ? I don't know how the **** I didn't know this much.
Armstong, burley, duran, walker and robinson spring to mind, from the present day pacquiao deserves a mention
great call! leo gamez is a hard core mention, one of the few fighter to win four world titles in four different weight classes, as others being duran, whitaker, pacquaio, jones jr. etc.