Clearly, the coaches are not trying to create a 22-position team in every recruiting class.
The curious timing of the offer/commitment of Kinnel has something to do with this I'd guess. Also, probably how the '13 class is looking now that they've arrived. Optimistically, CB looks very strong with Stribling emerging, so guys may move to Safety. Pessimistically, some of the CB recruits don't have the one-on-one skills to stick there, so guys may move to Safety.
Also, it's possible the coaches are re-thinking their bigger-is-better philosophy a bit in the secondary. See: offers to Crawford and Kinnel, plus Avery seemingly ascending quickly ahead of younger but bigger players.