re: Assuming Greer goes on IR, what's the move at CB?

White obviously moves up to the #2, but nickel will be interesting. I think they use a ton of Jenkins/Vaccaro/Carr there so I'm hoping too many holes won't show up.
Although whoever it may be, I'd like to bring someone to start learning the system just in case of anymore injuries. Because we really can't afford anymore at this point with anther 6 games to go.