Having recently done the group event to defeat the high priestess I think something needs to be done so that the people who are defending the three external points also get credit for the event.
As it stands now, the best way to clear the temple is to clear a POI and then leave 3-4 people or so to defend each one, and then have a group go after the priestess in the middle. However, if you’re one of the people defending the outer POI’s, you don’t get event credit when the priestess goes down.]