The bodybuilder is a benefactor or simply hes strongly overrated otherwise I dont know. He, his crystal chin and his low IQ ring made world champion in order a fat fighter and a smaller boxer. Who's next among today "unconventional" Hws who could beat or knock him down/out in the future? Old Chisora? One among Paul Bros? Retired Tyson? Belfort? Others?
Joshua can beat most big heavyweights because as slow as he is, they are even slower. I think Joshua loses to any top HW who is significantly faster than him.
I actually have Ruiz Jr pegged as one of those most conventional heavies out of the top 10. In terms of technically correct combos it's him and Parker IMO. Parker of course is so conventional and rehearsed his opponents see it all coming. The difference with Ruiz Jr is in AJ1 he backed his chin and kept throwing when under a huge assault, but everything he hit him with was a technically correct barrage.