If Will Campbell is there do you take him and move him or Trevor to guard?

For all the talk about how awesome Campbell is, I just don't see it. I remember him giving up pressures at the worst possible time. Whether that is his short arms or his lack of technique, for a sure-fire 1st round tackle, I just do not see the allure.
Yeah I don't recall him playing that well last season....not that I purely focused on his play, but in general, he seemed to struggle at times