Odds Prewett actually starts? Seems low. Wouldn't Newlan go over him?
Snyder will only play them on special teams. Shelly will start and play every snap unless he gets injured. 
Odds?
Prewett over Newlan if you're looking at the rotations thus far, but this probably bumps Newlan from 3rd string to second string.
Shelly will start and play the majority of snaps unless some circumstance happens where Prewett jumps in there and just kills it like Green did against Auburn.