N.Heller
I think there aren't actually 1600+ people. Dlzs are the ones running oasis, and the heat pills are actually ability stopping pills. If too many ability users were in oasis they could possibly be stopped, so they send them to the slaughter of their lackies in the other town. Dlzs are running a slaughter house, it's an all you can eat buffet, and all they have to provide is food and shelter. The humans do all the jobs, and take care if the other humans while the Dlzs get food and free labor.