There are several top notch prospects (Rucci, Spindler, Tengwall, Dellinger, and Milum) who are listed as "warm" according to 247sports, and rated higher than Crippen. Combine this with Blake Fisher already being committed, and it may have started to look like it would be a crowded house.
Don't get me wrong, though. It would have been nice to keep Crippen, as he seems to be a solid player at the guard position, and one we could have used.