That would maybe make sense then, depending on how many chapters are at the school. Just comparing to SC's numbers since I know them from being on Advisory Board, around 1700 total rushed this year. 11 sororities on campus and everyone averaged around 130 members. That equals 1430. I would estimate maybe 100 got dropped entirely and the rest dropped on their own. If you made it to pref round you were guaranteed a bid somewhere.
They are also colonizing Pi Phi this year so girls who dropped out or got dropped are eligible to rush Pi Phi here in a couple weeks.