Yeah, the way I understand it is say you are training a player in Shot Block. Well, Shot Block training speed depends on the players Inside Defense so if ID is around Average (6) for example, then SB would train slower than if ID was around Respectable (7). The difference might not be as great as if ID was 6 for one player and 12 for another player but the point still remains. ID teachs the player how to position themselves properly to force poorer shots when defending the paint so therefore, their Shot Blocking skill correlates to how well they position themselves.