Re: Holyfield as a h2h force?
Ali beats him, definitely.
Louis beats him, probably.
Lewis and Holmes I'd pick to edge him, but just, and not with much confidence in either pick. You'd have to say Bowe as well, but only on that rare 'best form' of Riddick's.
At worst, he's 50/50 with everyone else, and not at all an easy go for anyone.