I say we have no depth at CB, and it has nothing to do with this silly concept of a "shut down corner" whatever the fudge that is. Here is why:

(1) Depth defined: having at least one vetran who can step up and start for a few games if the starter is out - taken from an earlier discussion.
(2) Vetran defined: has more than 3 years NFL experience and has started at the position in question at least on occassion - ok that is mine, but sounds reasonable to me.

Our CBs:
Starters: Craft, Thomas
Nickle: Ambrose
Backups: Brown, Brooks, Craver, and some other guys that I can't think of off the top of my head - which is probably a bad sign.

Depth? Ambrose is the only one who even comes close to qualifying, and I'm pretty sure the second game he has to start teams go after him with quicker WRs and beat him (I really like Ambrose, but in a foot race, his best days have passed).

Thus, we are not deep at CB.

What the heck is a "shut down corner" anyway? Are these two examples of shut down corners? Deon Sanders and Champ Bailey? There can't be too many guys like that, so it would be ridiculous to say that a team needed such a guy to be deep at CB. Also, who really wants a Deon - he is a scheme nightmare, you have to protect him so he doesn't have to stop the run! A burden and not a boon, I'd say.

Would it make me happy if we had a guy who could take away a #2 WR? Heck yeah - that's what I think could make our defense dominant! However, do we need such a guy? No. Do I think we need another guy who can start at corner (even if he makes us a little nervous) to play behind Thomas, Craft, Brown, and Ambrose? Damn straight we do.