Imagine comparing Ali to Tunney, That’s like comparing me to a bird because we are bipedal- they fought nothing alike.
I can't blame Dempsey for losing by unanimous decision. Muhammad Ali would show him a "dance" that Dempsey had never seen in his boxing days. Dempsey would wonder: "What is this; is this boxing (I didn't notice Jess Willard dancing like this)?".
Ali in his prime dances away 10/10 times. The Ali post layoff would be a different story, in favor of Dempsey, a two handed harder hitting Frazier.
Where is the evdence Dempsey hit harder than Frazier? Dempsey himself said that he generally took a while pounding on guys to get them out of there, that ROcky hit harder. Triangulate & it is about equal. And Frazier is maligned as a one handed fighter, his right though not as powerful was pretty active. Without that he & Ali would never have set a HW punch stat record in the killing heat of Manilla.