Does Lt. Brennan contribute 1 or 2 stars? The counter shows one, the scenario text mentions two.
I would chalk that up to changes between when the scenario was written and when the boards were finalized. There is no way he can have 2 orders, so if the Lt is not on the board, ignore only his Orders. The whole point of the platoon having its own order is it is a reflection of the fact that PIR were better trained than normal troops and thus could operate with a fair amount of autonomy. Taking 2 orders from the US player would seriously impede his ability to prosecute his turn.