I'd say the top three are Rahman, Holyfield and McCall. Probably in that order. Rahman aint that old and was just Champion less than a year ago, he just fukked up, got tired, and got KTFO again by Oleg Maskaev. Holyfield is old, but still has a big name and with a few more wins over lesser competition could very well get a title shot. And McCall is a nut job with a granite chin and one hell of a punch. Just about everybody else has virtually no chance. Tua man is fat, and has not been KO'n the bums he's been fighting like he should be. I like Tua, but if he can't KO THESE guys, then fuk it, its time to retire.