In general I think he has some of the best horizontal pokes out there. His 66A is still fantastic, 6A is greaaat in footsie battles and gives LOTS of advantage, 1A is shockingly safe given it's range (-15 really isn't that bad when you consider how much space it covers), his 3B has got to be one of the best 3B's in the game (really, this move is alone is just about the only vertical you need, really. go play around with it.), 3K appears to be anti-step to some degree (need to test further) and I think he has some crazy strong TJ tools that stand apart. (9K to combo, 8B+K, 4B+K) He definitely has no trouble getting in. And between 3B/A+G/214B+G, he has a serious strong mixup that covers step, both button breaks, high damage command grab without meter (this is important!) and all options deal pretty high damage. (66-99 with CE, 55, 60)
I also think there's a practicallity to FLY that people are overlooking- FLY K is super, super hit confirmable. You have pretty much forever after any move that puts him in FLY stance to press the K. FLY sucks, yes, I agree but we have to live with it for now, and it's not unusable. 66B, FLY K hurts so bad and if they step 66B to punish FLY K (remember, can't be interrupted) and you don't do anything they lose out on a real punish, and if they don't step and you make them block FLY K, they get pushed out hilarious amounts in open field and they take some really, really high guard burst.
I think Aeon still has a lot more to discover. He's definitely not top tier and probably in most need of buffing if we're speaking objectivly, but I think there's still power here. (For now.) I'm repping him locally and frankly he does just as well, if not better, then my Algol, and I'm not slouching in this game at all.