I think he's underestimating how many past heavies could beat the recent crop of big heavies like Klitschko & Joshua, & I'd pick Tyson & Ali over them confidently. He didn't say Tyson/Ali would lose as he called them something akin to forces of nature, & I got the impression he didn't want to be too provocative in the first couple of minutes to begin with. However, fighters like Holmes & Foreman I'd give a very good chance to beat them & I'd probably consider them favorites, & there's many others I think could as well. I do think Joe Louis & Marciano would be too small, if I remember right Marciano was 187 or so for a lot of his best fights. The simple fact is that the best big athletes these days aren't choosing boxing at nearly the same rate. Watching Wlad get blitzed by Corey Sanders(I think he was with Steward by then, anything before Manny wasn't his prime) & some of the fighters that buzzed Joshua, & there's a lot of fighters I could see beating them.
The rest of it was great, thanks for sharing. I'd have some minor quibbles, I think he rated Cotto's defense only at an 81 rating, but the guy held Mayweather to a 26% connect rate when Mayweather averaged 46% overall in his prime years. But they were only minor, I'm probably going to falldown a youtube rabbit hole & watch a lot more of his videos soon