Reading week two he was a nut job and would have been voted out then. Seems he wasn't going to be around for long, no matter what.

I think they cast the show to have wild cards, misfits and a mix. If they make the cast, all contenders, it wouldn't be as much fun. This is planned entertainment and I'm pretty sure the people doing the casting are good at it. I think they have done a great job of making things interesting.