Henry Armstrong Barney Ross Floyd Mayweather Roberto Duran Pernell Whittaker Jimmy McLarnin Julio Cesar Chavez Manny Pacquiao Tony Canzoneri Young Peter Jackson All off the top of my head
Pryor is H2H GOAT at 140 I think Pacquiao is the best chance, someone who could maybe match Pryor's volume but with more power and speed. Meldrick Taylor is another one who has a chance for the same reasons
Barney Ross would make Aaron Pryor regret every life decision he's made as his face is puffed up from a 150-135 UD Ross drops on him Wilfred Benitez Barbados Joe Walcott Packey McFarland Oscar De La Hoya Jack Britton Young Corbett lll Fritzie Zivic Primo Carnera........