When you've got a QB throwing directly to the opposing team's DB's, I don't know what play you can call to prevent that other than just running it on every down.
Also, I wish we had a better idea of the dynamic between Pruitt and Chaney. Chaney could have been advocating for a QB change ever since the failures in the 2nd half of the Georgia game, with Pruitt constantly overriding him with regards to JG. Or, it could be that Pruitt has given Chaney complete control over the offense and it is Chaney that is stubbornly and constantly fielding JG. Either way, it is a failure on the coach's part. However, I sense the former scenario rather than the latter, but this is pure speculation on my part.