Those bigger programs are either full or have most of their prime targets already leaving some stragglers. At this point the class looks like its met most of its needs and we are kind of in last second recruiting mode here scooping up a best remaining available or 2.
One school that seems to be having a very hard time wrapping up recruits is Pitt. I think they've lost 10 or so verbals since they forced Stache out. I'd be worried about them swooping in on recruits last minute.