Tyson had trouble with Botha. Botha isn't anywhere near Marciano's level. Botha was gatekeeper status in his prime
Tyson basically lost his love for boxing after Holyfield 2. Marciano KO 6
That too.
I remember hearing his Girlfriend had a miscarriage before Klitsckho fight. Pretty good fighter just had a lack of heart and a lot of injury problems.
I think we found that out with Foreman vs Moorer.