Fair enough, maybe key doesn't quite describe it right, but I think that's just semantics. Important part of the squad if you prefer. Clearly it's quite important to have another left back, otherwise what are we even discussing? If we don't need someone to do his job then we definitely shouldn't give him a new contract. We do though, which is what i'm getting at.
I agree that he did pretty well when he played. It was 2 games though. He's only made 8 league starts in 2 years, and only made it to the end of 5 of them. My concern is that if we have to ask him to do more than that he might not be able to. That's really not ideal, either from a competition for places viewpoint, or from a potential injury one. Again, i'm not saying it's the worst thing ever, I just don't think it's a no brainer that everyone should be dead happy about either.