My Alma Mater when to delayed rush, and the sorority chapters are half the size they used to be. Having fall rush encourages young women to pledge a sorority to be busy, have a group of friends, etc... When rush is deferred, many already have found their cliques, groups outside of the greek system.
I think there are strong reasons for deferring (especially at big schools with so many sororities), but it certainly does hinder the numbers.
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