Well it matters only because, in a two gap system where the DT/NT in the 3-4 has to hold the middle, he is responable to hold out the two gaps on either side of the center. Some 4-3 DT's can do that aka Kris Jenkins, but that said some 4-3 DT's can't aka Corey Williams. All DT's that play should have the ability to hold one gap but few have the ability to hold two gaps.

Thats why losing Kemo is so hard to replace, he would be an average 3-4 NT as he was with the Raven's but he has the skill set to do so, a person with the ablitiy to stuff the run and eat up space isn't just about being big.

Williams is probably the best bet.  He's got some good skills and he's reasonably young. I'd be willing to pay a 4th rounder or so to get him since we'll probably trade away the 2011 1st rounder for some more picks in next years draft.