Captain Munnerlyn (CB, Carolina) seems like the kind of direction the Steelers might try to go in FA. He's a little dude @ 5'9" so he's gonna be a nickle guy covering the slot. But with the way Gay played, the Steelers might be good going with Allen and Gay on the outside with Munnerlyn in the slot.
Then they try and find the right bigger CB or 2 in the draft for Lake to develop for the long term.
Munnerlyn is short, but he's a good athlete and cover guy. And he's only 25, so he could be a viable #3 for a nice little run.