On a related note- If you decide to have Legionarii or Auxillia Archer elements, Ps(O), are you forced to purchase either 1 per one or two Bd(O) for every element of Bd(O), or Ax(s), or can you purchase fewer i.e. I have 12 elements of Bd(O) and 12 elements of Ax(s). If I decided to have the supporting Ps(O) for the Bd(O) and Ax(s), would I be forced to have either 12 or 6 elements of PS(o) for the Bd(O), and 12 elements of Ps(O) for the Ax(s)?