He went 2-0 vs. Larry Holmes WBA- Tate Weaver Dokes Coetzee Page Tubbs Witherspoon (he was also WBC champ) Smith WBC- Thomas Berbick IBF- Tucker So, how well does Pre-Tyson Spinks (late '85-'87) do vs. these guys? Spinks was 200 Lbs. for the first Holmes fight. Vs. Cooney he was 209 Lbs. and carried it well. At 6'2" with a 76" reach he was not undersized IMO. He was faster and a better overall boxer than most of these guys. He also had pretty good power as a heavy... he dropped Cooney in the 5th and stopped him in the 7th. I think Spinks vs. Witherspoon, Dokes, Thomas, or Tucker would be good fights.
All of them were capable of beating Spinks,imo. I doubt that all of them actually would have done though,as they were underachievers. Mainly because of motivational issues.