If you have 7 people in a room when there is only supposed to be 6 and the theory is that one of the people must be a Martian, having a side theory that one of the 7 was replaced by the Martian doesn't make any sense. You still have an additional person. At any rate the confusion doesn't stop there. Why did the cops say they would ride ahead on the bridge only to ride on it at the exact same time as a heavy fucking bus? They deserved to die.