I don't know, man. I mean, he would have to bump like 9 of the following. Ali Louis Lewis Marciano Frazier Foreman Johnson Holyfield Tyson Liston Holmes Charles Dempsey Jefferies Wlad Klit Patterson Tunney Walcott Wills Langford
To be honest, if Fury beats Usyk, the best I can do for Fury is to put him within the Top 20 All-Time Great Heavyweights (barely). His resume will always be stained for just getting by a 0-0 MMA fighter making his boxing debut, Francis Ngannou.