If you are eligible by NCAA rules and you are refused admittance by the school you signed with, the NLOI is null and void. That would make you a free agent again and you can sign with anyone.
The questions I would have is (1) is he still enrolled at the same JC and (2) if not, would he be eligible to enroll here in May (I do not know the ACC rule)..
The questions I would have is (1) is he still enrolled at the same JC and (2) if not, would he be eligible to enroll here in May (I do not know the ACC rule)..