[Lewis.]

They will want to make it interesting so they will try to make it so that the 3 people in the room aren't really close.

If they chose the 3 outsiders then it would be boring as the outsiders would come to a 'moral' decision and just let one of them have the pass. Think it would be interesting to choose 3 housemates that aren't very close - say Deana, Conor and Sara/Becky/Scott - That's an insider, an outsider and a floater.