Jeeves Jenkins I am no U21 coach but I will give you my opinion even though you are not going to like it. Your guy looks great, he could be a fantastic PG/SG or SF in the future for our team...BUT...that Jump Range: atrocious is a massive problem. Someone else will correct me but I believe JR is either the slowest or the second slowest skill in the game to train. Even if you get a level 6 trainer, at age 19 and at 6'3" I doubt you could pop it every two weeks. To get is up to just respectable is then an entire season of training - yes you will get some secondary pops but by then his OD, passing etc will be just too far behind. And think, what will that do to your other trainees too?
Maybe one of the NT people can comment if they would play a PG or SF maybe with less than respectable JR, that would be your only chance. Sorry dude. I drafted an AMAZING guard a while back, 18, high potential, respectable in almost all his guard skills, and pitiful for OD, I think he sold for 100k or less - that one bad stat can be a killer.