Austin Grandstaff does not look, particularly, like Mike. In a time where teenagers are coming out of high school looking like grown men, Grandstaff is thin, sports a high school haircut, and isn't a big time athlete.
If you can play, though - really play - it doesn't matter. and Grandstaff can really play. He shoots the ball with a natural, effortless stroke, and his handles are tight, meaning he can make plays against more athletic guys. He's 6'5" and, while he may not be the next D'Angelo Russell, he should be making big plays for Ohio State for years to come.