Gerry Cooney..he had size, reach, and big punch, plus he could take a punch. He was mis-managed and under-trained.... They never prepared him for a 10 round fcontest. I heard he stayed up all night before big fights.. something was amiss. Ask Larry Holmes about Cooney.
Kirkland Lang Howard Eastman Herol 'bomber' Graham to a lesser extent there's also the possibility of floyd falling into this category too...
If Jermaine Taylor could have lasted over eight rounds of a fight he would probably be undefeated and top 3 p4p right now...but he cant and thats too bad:-(
He has as much as talent and skills as Floyd does, sadly almost the same personality. Thank goodness he doesnt have the same big delusional fanbase that Floyd has.