Here's what I understand about a second-degree shoulder sprain: it's worse than a first-degree sprain. I would think if Quiz Rogers plays in the Civil War he runs the risk of worsening the tear, possibly taking him out of whatever bowl game the Beavers get. (No worse than the Sun Bowl.)
I'd suppose Riley will start the game without Quiz and play him, at most, only if needed.
For all you OS fans.