He's on scholarship unless he hires an agent. He can say he's entering the draft and then change his mind as long as he doesn't hire an agent. Stanford being on quarters or semesters doesn't mean anything in this case. He's a junior, his scholarship is for the 2016-2017 academic year or 4 years or until he graduates (Depending how Stanford defines it). In any event, this is not the end of the year and he did not graduate so he's technically still on scholarship until he does one of the 3 things below...
1. He would have had to either graduate or...
2. Hire an agent or...
3. Not be enrolled for winter quarter in January to be no longer on, or eligible for scholarship.
Also, once you sign your original scholarship, you never resign again. It auto renews.
See above.
* Unless the NCAA has changed the documents and clerical aspect of scholarships. If anything, schools look as scholarships as a four year, comprehensive agreement where it used to be a series of one year agreements that they could terminate at any time.
Malik would have graduated. He fulfilled his agreement with ND. Easy to say when he's the back up. Had he been the starter... hell yeah he'd be breaking his commitment!