You're going to disagree with me for presenting new ideas but hear me out 6'6, 240lb rangy switchhitter with decent boxing IQ. He lost multiple times but he's gotten better since then He'd be a force to be reckoned with in the 70s. He would be a titan in an era of little men. Just like Usyk, Hughie would be a problem is past eras
It is unlikely he could compete well with anyone in the top 20. And, against the punchers, he would get wrecked.
Vitali is a fighting man who held Fury's belt to age 41. At 34 he was in the middle of a four year injury hiatus.