Meh, those are all assumptions. Elastic effect is probably not damaging or rewarding for a player training. It simply equals out eventually.
It may be just like with the primary/secondary skills training. It doesn't matter weather you train secondary(slower trained) skills early in career, or later. It makes no difference whatsoever. Mathematically, the results are identical.
It's better to first train secondary skills for a different reason, length of out of position training. But it doesn't affect the ultimate result.