Sorry for the confusion, earlier posts seemed to imply OH School was only half filled...
Anyways, you guys are 100% on, money talks. Never be confused, education is a business and the teachers union runs education in our state. If TUSD track record with Heritage is an example, they will only open OH to K-8 after an increase in MR. I wouldn't be surprised to see an increase in MR for the Groves II tied to a commitment to extend OH School.
Principal's within the District also fight for students. Think each child is worth 11k per year. Schools will do all kinds of things to increase enrollment prior to norm day. The more senior principal will generally hold more influence over the Board and likely keep their classrooms at full capacity.