I think Star potential is really underestimated in terms of what you can do with a guy with that potential.
yer ok this guy is ONLY ever going to be a bench player at best, but you get his OD to Proficient, his ID to Proficient, and he is able to sit on the bench for you at SG/SF/PF
and thats only 4 pops. what you do after that is up to you. 2 pops in JS gets his JS to Proficient, two pops in rebounding his RB to Proficient.
so for 8 pops, you could have 4 stats at Proficient - Thats not bad!
Then - i would smash his DR. Ive got a guy who i drafted in my second season, has Starter potential - I got his ID up to proficient and IS to Prominent, but I pumped his DR to Prolific. Yer ok he doesnt dominate at PF, but having a bench guy with really good DR at PF, is a nice little tool to be able to use in some games.
So yer. depends on the rest of your training plans - JS and RB is easy to incorporate him into, you would need to sacrifice 4 weeks (approx) of OD and ID training from another trainee over the course of the next season or two.
cause unfortunately, the other alternative is get nothing for him on the transfer market.