If you're training the guy you mentioned as a small forward, then you need to get in some Pressure training (pehaps 1 position perssure training at PG?) to get his OD up. OD is the skill that it takes longest to train, and it takes even longer as your player gets older. Along with Pressure, try some 1 on 1 training to improve driving, handling, and Jump Shot. Both those trainings would also be great for your new trainee.