Not sure that what JHS is saying about z-listers is accurate. When Harvard accepts 50-100 z-listers they become members of the following year’s class so no effect on the current year’s admissions rate. The 50-100 z-listers that were accepted from the previous year’s applicant pool somehow get mixed into the current year’s stats. Since they are 100% committed to attend, one could say they actually bolster the yield.