WF has less attrition than most football programs, but every year a couple of players leave in search of playing time, to be closer to home, because of grades, because they don't like the school or a million other reasons (IIRC, WF lost a player a few years ago so that he could go to the same school has his HS girlfriend
). Each incoming class has about 20 kids, the retention rate for the football program far exceeds that of the general student population; even so, the staff knows that a couple of kids in each class are likely to move on for one reason or another.