If an ancient and arthritic Jim Braddock and Two-Ton Tony Galento could deck Joe Louis, there's a real possibility that Ibragimov would have beaten him rather badly, and also, there was an era when Max Baer was heavyweight king---without using his left hand, now that's weak opposition, Floyd Patterson would most likely go out feet first vs many of the top ten heavies around today. Looking at the shape Liston was in when Ali fought him, it's not really that impressive. Rocky Marciano, have you stopped and calculated the sum of his opponents' winning percentage compared to one of today's heavyweights? If time travel was possible I think a lot of "ATGs" would be exposed by today's "utter garbage", you know the same utter garbage that the top two supposed challengers are afraid to fight.