no fatter boxers are not better kliturd. its the age factor that is important here, size is not relevant.
Fury has the mental toughness to beat a drug unfocused Tyson from 1990... A prime Tyson though? 1988? It's just a question of whether Mike could find that 6'8" target.
I'd say mike would eventually mow him down he'd be hitting whatever he could arms elbows below the belt and fury would react and get into a fight he couldn't win. I'd love to see the prematch build if mike would take furys antics and vice versa