McCown. Thought that before this week began too.
He's a guy that can still play. He can be productive. It's said he's an excellent mentor that will be sought after to be a QB coach when he retires. Very convenient for us with an inexperienced QB coach, and a highly drafted QB incoming.
He's a professional. I think he would play well, but not well enough that too many people will be upset when the rookie takes over. This would be just an amazing "get" for the clubhouse and the field.