Wilder, Joyce & Fury are all unique physical specimens and a credit to this new era of heavyweights. Joyce matches Fury's stamina & weight, two 270 pounders but Joe is all lean muscle, total freak. Men this big historically have been heavily flawed. AJ is just another chinny low stamina Wlad without the clinching ability.
Look up Willis Meehan. The guy is Australian, but 300 pounds fit. Also a genuinely good boxer, maybe about as good as Dubois but much larger.