As for who would have won if they had met prime for prime, I'd always maintain that Tunney would be a tough fight. The man had simply superb boxing skills, a terrific chin, an iron will and unmatched ring intelligence. That said, I would shade prime Dempsey over prime Tunney under 1919 rules. 'That' Dempsey had a ridiculous level of pace and hand/footspeed that would seriously scare Tunney......and if Jack did manage to knock Gene down (hardly a rash assertion considering the 1927 rematch!) than Dempsey would simply stand over Gene and bludgeon him the moment he tried to repeatedly stand up!!!
Great insight as always sugar J