Mitchell has the size to clog up the middle. Cavenas has lost 15 lbs since last year. My guess is that leaves him plenty big enough to play off the tackle and hopefully quick enough now to come off the end. To me, Nace needs to play on an end. I think he has the quickness to create some havoc for the QB.
I think the key though is that we have a lot of quality depth. We should be able to substitute liberally in order to keep the line firing on all cylinders over the entire game.
Of course there is the usual disclaimer that this is only my opinion :-).