Why did Kelly not try QB 1B at some point in the Game?

Kelly has described our 2 QB's as 1A and 1B. I wonder if he ever had the thought of giving QB 1B a shot at playing. Surely he could not have done any worse than what we saw out of QB 1A during the 1st half and most of the 2nd half. This LSU team will not go far so long as the majority of rushing yards are by the QB.