The number of holdbacks on the upper tier U15AA teams are probably pretty consistent with 4 to 8 holdbacks for the Crabs, FCA, Hawks, Madlax, Clue Blue, etc. So it is a relatively level playing field when they are playing each other. But the holdbacks increase the great disparity between the haves and have nots when playing the lesser teams which have less talent to begin with and lack holdbacks.

But, what about the kid that does not make the team due to the holdbacks or does not start / have a prominant role because of the holdbacks.

True, that when they are 17 and the undersized holdback no longer has the advantages that he had at 15 - will balance out. But what about that non-holdback kid that is denied something due to the holdbacks. Just saying!