If you don't think AJ's abilities are ATG, that's totally understandable, but he's not a fraud. He's never ducked anyone, and he tried to make all the big fights happen. You can only beat what's in ****ing front of you.
I don't think the rounds were so straightforward. There was a lot of power above AU's knowledge and experience which could be built upon by AJ
AJ landed very few shots and was on the verge of being stopped at the end, Usyk could have gone on for a few more rounds if need be.