If Ali didn't have his speed would he have ever been champ? If Foreman didn't have his power would he ever have been champ? If Floyd didn't have his reactions would he have been champ? You can't just write off physical attributes fighters were born with, it's a stupid question.
Does a 5"10 Michael Jordan become a basketball superstar? Does Gary Kasparov become a chess genius after a brain injury? What about a 6"7 240lbs Lance Armstrong... would he have won the Tour de France? Troll thread.
I'm not sure what difference it would make. Are you also suggesting his reach shrinks from 81" to 75" and his power goes down also? Height is only one commodity.