If you could somehow make a boxing league and have Benn, Eubank, Watson, Collins, Calzaghe and McCallum in their primes against each other at a fair catch weight I think that Mike would be the only one to beat every other fighter. I think one of the others at least would beat Calzaghe in their primes, probably Collins and Eubank and maybe even Watson too although I do think he'd easily beat Benn but McCallum would beat all 5 of the others IMO.