From what I know, a tall player will get more pops in RE, IS, ID, and SB. But from the game manual:-
players will improve more quickly not only with additional playing time, but also a more skilled player will improve more quickly. For example, a great inside defender and rebounder will find it easier to improve his shot blocking than a poor inside defender and poor rebounder would
Therefore, what if I have a tall player who is not a good inside defender and also not a good rebounder, and another player who is not as tall as the previous player but is a good inside defender and also a good rebounder, and from these two player, which one will have a better pops in RE, IS, ID, and SB.