[RCW1945]

There was a major difference between Nick (BB1) and all others.
His was a deliberate and extended plan (using banned equipment - pencil and paper) intended to cause himself to win the prize-money.
It was clearly pre-planned shown by his desperate efforts to induce sympathy from the other HMs by the "dead fianceé tale".
All the others have come after boredom/claustrophobia has set in and were spontaneous acts with no ulterior motives.