This game is all about creating missmatches.
So it will be very good if you have a Center who has high Jr and Js.
He will play an opponent who most likely has nearly no OD, because of that he wont be able to guard your Center if he is far away from the basket very good.
There is the missmatch :D
Btt. I would sell player 3, he cant be trained, and your trainees will be better than he is when they are 20.