Where Can The Falcons Least Afford To Lose A Player?

Let me preface this by saying that quarterback does not count, because it's way too obvious a choice.

What position can the Falcons least afford to have a major injury? This can be because the starter is so damn good that losing him would be devastating, or because the depth is so terrible behind the starter that it causes you physical anguish.

I'm not trying to invite trouble here so much as suss out which positions you feel are the strongest for the Falcons, but may not have the depth we'd love.

Sound off!