Mike Tyson
Harry Simon(gave Winky a hell of a fight in just his 15th fight.
Ike Ibeabuchi(could still be champ)
Sonny Liston(if he had been born a few years later he may have been the most dominant fighter of the golden era)
Roy Jones Jr(I consider him it, but he could have faced more SMW's)
James Toney(better work ethic)
Michael Nunn
McClellan if he hadn't gotten hurt in his fight
David Tua(what a tank if he stayed in shape who knows)
can't think of any more at the moment