The great boxing switch?

Great question. Dempsey would be undefeated in Marcianos era, especially with his resume of subpar guys and has-beers.

Marciano would lose in Dempsey era. Tunney for one would be too much, especially i f he fought the black guys Dempsey would not.

Interestingly R Marciano could have beaten Jack Dempsey with 50% probability

But .... Dempsey would have wiped out any of the great heavyweights of all seasons

Jack Dempsey vs Ali, Dempsey wins within 8 rounds

Dempsey vs Foreman, Dempsey wins within 5 rounds

Dempsey vs. Holmes wins within 6 rounds

Dempsey vs Tyson, within 4 rounds

vs Lewis wins within 8 rounds

vs Klitschko brothers puts KO within 6 rounds

I still doubt with Joe Louis

Great coaches have mentioned to Jack Dempsey, as an unprecedented miracle, I agree with them, I always had devalued until their achievements seriously investigating I found a monster