What if the Manassa Mauler had destroyed Tunney in 90 secs ala Tyson - Spinks? Would it be his best win? How does it impact Jack's career?
Seeing as Tunney's legacy at heavyweight was beating Dempsey (twice) and becoming champion, I don't think Dempsey's legacy would've improved all that much tbh. People would've criticized him for fighting a blown up light heavy (even if he was the light heavyweight champion)
Might help a bit, just because the film quality would be good enough that later restoration would look extremely clear.
I think it would be Dempsey's best win considering Tunney's wins over Weinert, Delaney, Gibbons, Greb, Risko etc.
History would have definately changed, no Famous Long Count, and no conspiracy theory of Mike Tyson vs James Buster Douglas long count on Feb 11 1990 with Naughty Polly The Parrot sitting perched.