No one has unified in less time having to fight different guys than AJ, other than Mike Tyson. Bowe got all his belts in one fight. Bowe had a short career fight wise but its pretty solid. Better than Joshua's? I'm going to say no BC I really don't include Golota BC he was out boxed and won on technicalities . Joshua has fought numerous top ten guys in only 21 fights, not sure fight by fight anyone has a better resume than AJ . Outside subjective opinions of relevant fighters he's fought , all of Joshua's top wins barring Klitchko have went on to win, I'm sure Parker will win too. Let's not forget he's also defeated 7 undefeated fighters , that's a huge chunk out of 21.