The reason not to add these players to the draft pool is that they are overpowered for training.
Yes, their inside skills would train way too fast. And outside would be basically untrainable
Yes, but it's not exactly the same. The reason is because there are differences in the importance of different skills for the game engine, the salary cost of total skill points, and the training increase vs height for different skills using the training types. It's easier to train a short guy to high inside skill levels than it is to train a tall guy to high outside skill levels.