Tua, utilizing his height and reach advantage glides around the perimeter of the ring all night long while keeping Tyson at the end of his snapping jab for something around a 9-3 type decision.
If by late 90's you mean the 97-99 version of Tyson who quit against Holyfield and looked like **** versus Botha then I'd say he KO's Rahman, Tua and Byrd are 50/50's and Ibeabuchi beats him provided Ike doesn't do something crazy and gets DQ'ed (a real possibility).