No, I'm not ???? And I feel like you're just being dense lol.
Nathan COULD have played it cool with Bru if it were good for his game. Him being a catfish had literally nothing to do with him deciding to tank Bru's rating to survive. Also, those ratings were private and didn't affect his reputation with other players since it was the second to last rating of the season. If Bru stayed in the game and someone else got lowest rating, he would never know that Nathan had rated him poorly. Catfish have to maintain their relationships just like anyone else. Being a catfish doesn't change the winning strategy of building and maintaining relationships/loyalty. How hard is that to understand?