AJ can't impose his size, weight, physicality on the vastly more skilled and talented master boxer genius Usyk. He did what Usyk, who bamboozled him with his speed of hand and foot, footwork, feints, movement, counter punching and intelligence, allowed him to do. AJ did somewhat better in the rematch but he still only won four rounds absolute max if you want to be generous to him. He was outclassed x 2 and the success he had in round 9 was hugely overstated and it all started with him going dirty and then immediately pouncing on Usyk while he was trying regroup. Usyk paddled his ass for his insolence in round 10. It's not about what AJ didn't do it's about what Usyk allowed him to do. Hence why it played out the same way in the rematch. Usyk simply wasn't there to be hit and when he was he could take it from the much bigger man because he's super tough. In 24 rounds of action only one of them was hurt (a few times) and in danger of getting stopped.