of missionaries
So with missions, early HS enrollees (which is more common nationwide), injuries I think you’ll see more roster fillers even at a program like BYU that traditionally has been extremely difficult to just walk on at just because the year to year roster will be difficult to predict.
Also I think the talent gap between a lot of these girls is not nearly as wide as people think. Get kids in that system playing with better teammates and they might fit in or shine more than what their history to date would make you expect.