A host of South African heavweights come to mind...Coetzee, Knoetze, Schutte (Not that he fought 15 mind) etc. As for the lighter weights, I can't really recall anyone right now. Who would your picks be?
I've heard Peter Maher was a real front runner who thrived off of his training, which was ridiculously extreme. He became a hardcore alcoholic so I'm imagining his stamina went to **** towards the end of his career.
Briggs should not even be on the list, he has asthma .. Lyle was not great ... Bonavena was not great ... in heart or stamina ... Liston was not terrific ... DeJesus was not amazing ... Yaqi Lopez was not great ... Oscar De La Hoya obviously was weak ...