According Stone's father, MD has upside.
"All four teams were quality choices," his father, Bob Stone told IMS tonight. "Maryland, they've got upside."
http://maryland.247sports.com/Bolt/Diamond-Stone-Commits-to-Maryland-36447306
I would assume that is in reference to all the seniors graduating at Wisconsin vs. MD losing 1 star and a couple of low contributing role players. If Stone is as good as advertised, and ends up a 1 and done, then he doesn't want to play at a school "rebuilding". I use that term lightly, because Wisconsin will good next year, but probably not as good as this year. With MD, there is hope of much bigger things next year.