Ashley is right, as he so often is in his coverage of Baylor basketball. Maston is undersized for an interior player and while he is very clever with the ball in his hands and has an outstanding midrange game, he has neither the range nor the quickness required to extend his game at the NBA level. I don't think scoring would be as much of a problem for him as defending.
The athleticism at that level, and at every position, is almost incomprehensible to most of us ordinary humans, and the size and level of skill that accompanies that athleticism makes the combination truly spectacular. I am not sure that Maston, despite being a very accomplished offensive college player, could stand up to the demands that playing at that level make upon him. I also question whether he is as devoted to basketball as he would need to be in order to do it. If he goes to Europe, he might well be successful, but that would depend on how badly he really wants to play at that level.