Barker has shown the ability. Where he has struggled is with dealing with some adversity. He's failed to show that short memory that a quarterback needs to go out and make the next play after a mistake. The question the coaches have to answer is whether this problem is fixable. If not then they must move on. Johnson showed some solid ability, but he was also greatly helped by a running tandem that was pretty much unstoppable. Johnson then made the easier throws to keep the ball moving and the defense off balance. There weren't too many difficult throws asked of him. So, that begs the question of how well he can makes those hard throws. He will need to make every throw in sec play.