Ayton certainly deserves to be in the mix and is a real threat to go #1, he's currently third on my board behind Bagley and Doncic. I'm not putting too much weight into a player's production in an exhibition game against a team like East Mexico, but Ayton's talent is off the charts.
I think you're underselling his physique a bit. Don't get me wrong, Mutombo had amazing physical tools, but Ayton is much more powerful of an athlete than Mutombo was. He's really strong and physically imposing, and I project he'll get stronger and stronger very quickly.
While he doesn't actually have a 44" vert, he's definitely got ups and his ability to leap off of either foot in traffic and in space is impressive.
He can dominate you in the post with his physical tools alone, he has shooting touch and range, can handle it a bit, is a beast on the glass, and has all the tools to be an elite defender.
Ayton's talent level is that of a superstar in this league. His IQ is still catching up to his talent, but it's definitely improving, and he had motor question in high school, but he looks to have been dispelling those as of late. I think it was the result of boredom in high school much like we saw from someone like Ben Simmons at LSU.
I still can't put him ahead of Bagley who I think is still the most overall gifted player in the draft and one of the most gifted talents of this decade, or Doncic who is putting up absolutely unheard of production against the best non-NBA competition in the world for almost any player let alone one of the youngest guys in the class.