How different would it have been....

[Master]

Hearns v Leonard 1 was a 12 round fight---Hearns would have won a UD.
Frazier had come out for round 15----Frazier was too shot to win anyway.
Salvador Sanchez hadn't been taken so young----no idea.
Hagler v Leonard was a 15 round fight---Leonard would still have won the mind game.
Jones Jr. had never gone to heavyweight----John Ruiz would be talking more crap.
Ali had joined the U.S. Military and not had a layoff.----may have got killed in Vietnam.

No way would they have allowed Ali to actually fight in the war.