Doesn't look like Jamar managed to get NCAA certification so current college players could play. http://ncaa.s3.amazonaws.com/files/bbcert/2016_Summer_Leagues_M.pdf With all the practice that coaches can run now in the summer maybe Pitino doesn't see the point and told Jamar not to bother.
Jarvis slips under that rule so it would be fun to see him play.