Agree completely with what you've said. Just because you're the best of a shit bunch of heavyweights doesn't automatically make you world class. I like AJ, he's a decent fighter but nobody seems to call it like it is with him and the hype around him is unreal. He's skills are average at best, poor head movement and barely throws any feints, he's getting by mainly because of his physical attributes. He has improved from earlier on in his career which he deserves credit for, but the division is really poor. He almost lost to a 40 year old Klitschko, seriously hurt by Whyte and Povetkin for me gave him a serious test. None of these guys at those stages of their careers were world class heavyweights, especially if youre comparing them to the names you guys are throwing out.
Someone mentioned above that they would've loved to see Ali/Forman against Joshua, he would've got absolutely murdered by any of the top 5/6 heavyweights of that era.
Sound man, I like AJ but the hype around him is absolutely crazy. He just doesn't have the skills of the all time greats. The only thing I disagree with your post is that he's likely beat Ali and Fraizer simply because he is huge compared to them. They would likely be Cruiser weights in modern terms. However as a boxer P4P he would be destroyed by those guys and by the likes of Lewis as well. I'll admit that I'm a little salty about his Gold medal when he clearly lost to Erislandy Savon but after the Conlan result I've come to accept that amateur boxing is as corrupt as the professional sport.
I really just think that being the best in the World doesn't necessarily make you World Class (even though that sounds silly). Also at this point AJ hasn't yet beat his 2 biggest threats so he hasn't even achieved that status yet.