Not only does Princeton require good shooters and passers everywhere, but also needs every position to be able to drive, handle the ball, and from what I've heard from people that use it, needs a little IS. The IS, though, needs to be high enough that the player can convert from the low post, but not too high that they start to revert to the low post instead of exploiting the weaknesses from the wing/perimeter/outside of the opposing defenders.