I find it almost impossible to compare fighters from different eras because there are so many factors that go into determining who would be victorious.An example would be Ali vs Wladimir.The first thing is there was absolutly no fighter back then that was as athletic as Wlad had the power of Wladimir along with the height and reach in one package.The closest would be Foreman but he lacked the Athletic ability of Wlad and was slower and was not as sharp with his punches plus he fought in the 220lb range compred to the 240lb range for Wlad.If there was a legitimate fighter that was similar in all these areas then I could give you an outcome to your matchups.