I think they should all be left wondering EVERY week from now on who the power housemate is. When you think of it, its the only way. You can't keep revealing to them week by week who the power housemate is because the process of elimination will make it ridiculously obvious as the weeks pass. No….. have them all strongly suspect Chris at the moment, but never quite get that confirmation. Far better from a paranoia viewpoint, and the ONLY way or they will guess immediately as numbers fall.