Well the only way he can be in the 2018 draft is if he graduates this summer (which he can't). I'm not sure everyone on here knows the rules. Diallo and Maker could go because they were a year removed from graduating from H.S AND they were doing a postgrad year
He could graduate early. Doesn't mean he qualifies for college. He could go to a prep school or overseas. Or not play at all.
All he has to do is graduate this summer and he is eligible for the '18 draft. There are some questionable schools out there that could help him "graduate" in time.