I think he will get in, one way or another. I guess he is a pure safety - four years as a safety at Purdue, went to Broncos camp as a safety, played safety throughout camp and preseason here. Doesn't mean he can't play other DB spots (I'm sure he has lined up as a corner in his life) but it would not be his ideal spot.
That said, we don't need to start a Canadian at S. We could bring on Allen at S, move Holm to corner, Griffin to HB and play Kramdi at SAM. Kelly goes back to a 7th DB role.
I'd be a lot more comfortable with that than continuing to roll with Kramdi/Kelly at safety and moving Allen to CB or some schlub they sign off the couch.