How your player developed would depend on his size and his age. If he is a 7'2 he won't get as much out of the JS shooting as if he were 6'2.
So how do you know if your training the right player depending on the height? For example a 6'6" SG does it mean a 6'2" SG will have better training at Jumpshot assuming they both played the same amount of time? And how much is the difference?