what in your estimation prevents duran from being the greatest fighter whoever lived?

[Ernie M]

He fought two long. and i consider him top 5 of all time.

So did Ali and Ray Robinson, but that should'nt disqualify a fighter. Leonard did too, but not even top ten in my poll. I can't remember who posted it here, but I agree with looking at fighters in their prime and maybe just after. Big fights and dominance at their natural weight, results in big fights( win or lose )are also factors. But you could have a point...fighters should get out and stay out once past their prime. It would make this much easier, would'nt it?