Tyson back in 86 could have beat anyone in any time period in my opinion.. the problem is that time period is very short.. maybe 2-3 years. once that window closed he went to mediocrity very fast. . I think 86-88 a prime Holyfield would have had real problems with Tyson as would have Ali or anyone else. , Tyson was so fast and had reflexes like a cat, and the power of sledgehammer. when that machine was tuned up proper it out runs anything on the road. in my opinion. However just like a Ferrari If you don't change the oil and get a tune up the car goes to shit. Cuz always said
" Fatigue makes cowards of Men" if you not in shape your going to get your ass kicked, and that’s what happened. Mike never got into and STAYED in real boxing shape after Rooney was fired. Rooney had Mike fighting every 3 4 months. after Rooney's depart. Mike fought once maybe twice a year, and thus never stayed in true boxing form. spent all his time in training camp trying to get in some kind of shape other then round, rather then working on technique to beat his opponents.