BU had a kid quit years ago, Mathew Lee, with eligibility remaining. He, if I recall, wanted to concentrate on studies. So MS could quit without "worrying" about ever playing hoops again.
The thing that would surprise me though is that if you quit you would lose your scholie. Thats tossing out some major dollars.
With that said I have NO scoop on MS...just offering one scenario or reason. HOPE MS stays.