However, we probably won't know how he would do against starters because Shelton and Limmer will be at center first/second.
I think they've moved on from Limmer at Center, because they haven't made time for him to improve on the calls. Just reading between the lines, or trying to fwiw, I'd say that by the time this year's camp and preseason is over the depth chart at C will be Shelton > Lampkin.
If something were to happen to Shelton you insert Lampkin. Limmer from there would be considered if he were to not be up, or if he were to struggle.
Limmer is first dude off the bench at Guard. Then Dedich, though his roster spot may still be up in the air.
Tackle who the fuck knows. It's a mess and probably doesn't matter once you get past Jackson & Hav.