Thanks Uncle Mike, I understand what you mean.
But if we extrapolate advancements and assume that the Team gets to the next level (20PPs), but due to lucky rolling they are sitting at 23 PPs. I believe (based on your above answer) that the Team could not aquire any new members (no PPs available to do so) but only the EPs can be adjusted.
One last clarification, please. If you get a recruit at 0 PP cost (Rescue the Innocents scenario), I assume that new Team member's Base PP cost will be 0 for the balance of the Team's Campaign (when calculating Re-Equip costing).
Lembit