You think William is a host?
It never really crossed my mind until last episode, where he was talking to his daughter and said he remembered she was afraid of the elephants in the other park, and she looked confused and corrected him "No i loved the elephants, it was mom who was afraid of the elephants" and William looked a little shook by it.
It wouldn't surprise me if the real William died, and this has been a host we've been following. I mean what if he's programmed to complete his mission and beat Ford's game or at least try to? thats why he refused to leave with his daughter, and left her high and dry, gotta complete his mission.
Plus the way he was convinced his daughter was a host Ford made to mess with him, in reality he's the host made by Ford.