I think Dempsey was one dimensional, put it that way. Tunney beat him with sound strategy and superior boxing skills. Klitch (with Manny Steward) would figure out how to handle someone like Dempsey without too much trouble. Agree though that Ali, Foreman and Tyson would likely beat Klitch. The others we will agree to disagree on.
"Let your food be your medicine, and your medicine be your food" Hippocrates.