I think this guy could be made into a very nice PF. Obviously he starts out a little bit behind, since he spawned as a 19 year old, but you still have a chance to make a very strong guy, either for your team or to sell at a profit down the line. Since your other potential trainee is also a PF, you shouldn't have any problem fitting him into a regimen.
I'd suggest training his guard skills while he is young, since they will train faster than when he is older. Also, they'll have less effect on his salary, and he won't be a burden on you while you are trying to promote to a higher league. Similar to the player in the OP, but more ambitious, I'd take his OD to 10-11, JR to 5-6, PA to 8, and JS to 12+ (eventually). After that I'd move to inside skills and 1v1. Rotating IS, ID and RB until I was just about done training him (3 seasons?) and finishing him off with a season of 1v1 for Forwards. At that point you'd have a 24 year old MVP PF with outstanding secondaries.