trudy1180: David C. is a dirty, scruffy looking guy, looks like he just crawled from under a bridge. Never smiles, looks like it is the last place he wants to be.
He does too smile, but it is subtle, not the ear to ear one that David A has. As far as the rest of what you said, he did not look that way at first AI tries to make the contestants look like their style of music. Remember how much Clay Aiken changed in season 2. Also remember that he wasn't even there to audition, but the people in charge chose him to at least try out.