I find the interpretations of the elastic effect to be somewhat bizarre. It's like people only think of it working in one direction. Sure, jump range will train faster because it is much lower, however, because it's much lower, it follows that all the other attributes it's linked to will train slightly slower. I bet you that whether you train it early or later, it balances out to pretty much the same thing.
With the new training system that rewards balanced player development, there may actually be further incentive to not let skills lag behind.
Do you think you'll turn him into a small forward or power forward?