As opposed to AJ who has fought..? Klitschko is a cautious fighter, if any of the other major heavyweights had rattled AJ like Klitschko had they would have jumped on him. Klitschko didn't because it isn't his style of fighting because it leaves you open. Whyte rocked AJ too who isn't near elite status.
Tyson has beaten Chisora, Johnson, Cunningham and Klitschko... all of which where either British champion, upcoming undefeated fighters or the undistupted world heavy weight champion. He fights southpaw and orthodox and boxed a Klitschko out the ring in Düsseldorf. He's got nowhere near the amount of credit he deserves for his boxing ability, especially against WK because of his personality, which like most boxers is a persona put on to sell fights. Ask any boxing fan and they will tell you Fury is the number one heavyweight alive on the back of everyone's last fights. He might not be the most entertaining and may have a NYC / European style which isn't as appealing as the aggressive styles favoured in Vegas and the UK, but he's undoubtably the better boxer.
And that's coming from someone who follows AJ and was at Wembley. There's nothing to say AJ wont achieve more and nothing to say he won't eventually overtake Fury, but right now he has a punchers chance only against Fury who, assuming the past 18 months hasn't sucked everything out of him, would dance around AJ all night.