Zhang is not even in contention to be considered an ATG. He needs to clean up his era to stake a claim. Beating Joyce is a good achievement but it's crazy to start talking about ATG after that.
Wlad was rather old when he got "schooled" and knocked out. Let's see how Fury looks when he turns 40.
Wlad was in his 20's when he got KO'd by the journeyman and two fringe contenders, he did vastly better in his 30's. Bowe was retired at 29, Zhang looks better than ever at 40. Wlad blew the fight against a green, there for the taking Joshua and should have rematched him.
Ali would have been trash today. Hard to find in the rankings. Maybe boxrec top 200 at best? Old nostalgia freaks needs to be humbled by the harsh reality all backed by cold hard facts... Accept or keep dreaming. Easy choice for me. I prefer skills and talent - Not only talent in a weak division from the past.