Mike Tyson 80s Vs. the whole "lost generation of the 80s" (alternative history)

22. XI 1986. that's the starting point - Tyson defeats Berbick and becomes the youngest champion in HW history.
Furthermore, until December 31, 1989, Tyson defended his title(s) against:
Trevor Berbick
Pinklon Thomas
Tim Witherspoon
Tony Tucker
Mike Weaver
Michael Dockes
Gerry Coetzee
Greg Page
Tony Tubbs
James Smith
(John Tate)
John Tate take optional consideration; you can but you don't have to
Many of these fights actually happened, but imagine if HW history happened like this instead of Tyson fighting: Spinks, Holmes, Bruno, Biggs, and Williams.
Would Tyson have passed through the "lost generation of the 80s" undefeated?