Alex and Mary Drake found out about the “Millwood Massacre” and the A game being played. They planted Dr Sullivan there knowing she was the therapist in the original A games. To source further information for the games they’re about to play. They simply chose these 5 because their story coincided with their original layout and saw it as an opportunity to expand upon the games they played. Mona, Alison and Spencer step in and help the girls reverse the game on Alex and Mary, and finally put them away or end them for good. Dr Sullivan writes a book “Pretty Little Liars” under the name Sara and maybe the girls create a division to help prevent girls around the world who are being targeted by people who’ve been inspired by these A games in America. Then it creates an opportunity to have PLL stories told in different formats of victims of similar scenarios.