Check the post fight interview of Holyfield vs Tillman. I think they had Michael Spinks on the radar right after his rise to HW (pay attention to young Riddick Bowe behind the scenes ). This content is protected
Spinks tries his cute tricks for a few rounds. After 5 he is overwhelmed by both the punch volume, perseverance, and darting aggressiveness of Holy...Michael gets stopped in 7 at the latest.
I think Holyfield would have beaten him with something to spare. I've never been all that impressed by Spinks north of 175. Holyfield inside-schedule.
I really don’t think that by 1988 Michael Spinks’ mind nor his heart were in the game anymore. Meanwhile you had a young and hungry Evander Holyfield who was set on conquering the boxing world. I love Spinks but he doesn’t win this.
A better scenario would be if Spinks made the cruiserweight limit in 1986 or '87. This would be war and a classic. I'd give the edge to Holyfield because of his superior workrate. As the post stands - Holyfield easily stops the ageing Spinks.