I don't agree. Alexander has always had a natural ability for much of what he's doing, he's simply gotten better at it, and coming in as a freshman he would be the guy you guessed of anyone on UTs roster at the time to make an NBA team.
Admiral has literally gone from a no name middling recruit who looked like an overweight frat boy to a guy you would expect to be fighting in the octagon and mauling everyone he faces. And that's just his physical fitness. He had no real offensive game outside of a middling mid range setup when he came here and now he is one of the most elite shooters in the country on top of having a respectable drive and post up game.
Again, nobody has improved all around at UT like he has.