Tyson was amazing to watch. Like Jordan. Speed and ability in abundance paired with good upper body movement and power. His feet were good at supporting exactly that. But having to follow usyk's lateral movement I imagine tyson mostly hitting usyk's guard while being out of position and usyk punishing these situations clinically. (I see a chance though, that tyson gets to the target before usyk gets into the fight in rounds 1-3 and that he might ko usyk then.) Usyk is a bit heavier with much better feet and ability to understand his opponents style. Usyk's stamina compared to tyson's does the rest. Late rounds would be a catastrophe for tyson. Off the top of my head, i imagine bowe (short prime) and Lewis as history's hardest heavyweight style matchups for usyk because of their flexibility in creating dangerous situations while having massive punching power and probably being able to walk through a lot of usyk's shots. And maybe prime wladimir klitschko. Not sure about klitschko because of his need to control everything in a fight in order to explode but if he could box usyk for a moment like fury did in his best moments and then hit him with a few good shots it would be over. Ali vs usyk would be a sight to see. Pure boxing bliss