1. he's only fought a few fights so far. The best striker is someone who can adapt to those who are looking to exploit their flaws. So far almost nobody has been studying him, gameplanning how to beat him.
2. Only fought a few good strikers. Not seen him deal with enough styles.
3. Outstruck by Volk and wasn't looking so great against Max at the beginning. He relies on his power to get it done.
He'd need to fight more strikers, to see him solve a bunch of puzzles. Plus face some who have more power to put him at risk (besides Emmett). How does he deal with someone who's more of an active kicker? How does he deal with the clinch?
He has some of the best MMA boxing for sure. I dunno if it's the best, but it's up there and improving. But there are other great ones like Yan, Poatan, Cong.