I have a hall of famer potential SF who is 6'9'' with strong inside shot, but i want to increase his driving (mediocre) and handling ( pitiful).....is one on one the best way to do that?
But watch out man! He is already 25 and his training would be very slow. And even if you train him he would never reach his potential. In short, his potential is meaningless since he is too old to train well. I think both of you 19-year-olders are better to train than him. You can safe money for the next season and then buy some 18-year-old guy and train him.