There's a good article that talks about Charlie and how he's good player to have right now. He can run the offense well and the team has confidence in him.
The question is, even if the Doctors clear him to play this week, maybe we should go with Charlie against the Raiders and give Ben an extra week to get his head cleared. It's a tough call because you don't want him out too long and have him get rusty again if you can help it. But if they say he's fine, maybe he should have 1 extra week to heal up.
Obviously if he's not ready we're in good shape this week with Charlie in there. His health comes first.