Who are the very best guys to jump weight and make waves in other classes? Obviously Thomas Hearns is among one of the best. You can include him in your list.
Put Arguello straight in the list. guys like DLH, Mosely and PBF deserve mention too among never guys.
Mosley's frame was chemically enhanced though. Lot easier to put on unnatural size with an unnatural method.
It's amazing how many guys just fail at going up in weight. It matters so much. What about Duran? Didn't he start at 126 or 118? Was a dominant LW and went up to 160 to almost beat a peak Marvin Hagler.
Almost beat is a stretch but Duran is a good example. Two lesser known examples Georges Carpentier Len Harvey. Jimmy Ellis? Mickey Walker?
Vinny paz.light weight with a big head small body. came back looking like the hulk at middle.I thought he was going to get up to HW like something from a cartoon.