He didn't lead that offense anymore than JG did when he was on campus. It's painful, but it's true. I'm sure he's a nice guy, I'm sure the guys on the team love him, just like they did JG, but it's more likely that things only get worse as the level of competition increases, than the opposite.
He's not some freshman with a massive ceiling of possible improvement ahead of him, but a junior with 3 seasons of training, and 13 games under his belt. His ceiling is far closer to his actual game-day performance than you care to acknowledge.