I don't think anyone has already mentioned this--FSU uses separate quotas for freshmen and upperclassmen with RFM. So every chapter takes a minimum number of upperclassmen.
No. That's not how uppperclassmen quotas work.
Every chapter can take a number of upperclassmen above the "regular" quota, IF THEY WISH. No sorority is *forced* to take upperclassmen.
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It is all 33girl's fault. ~DrPhil