100% They were a great team.
I felt Rachel spent most of the game quite isolated, especially after Amanda left. She was able to win people over because he was such a great liar, even when cornered.
Whereas, as you say, Stephen won the Faithfuls’ trust by getting on with everyone and forming close friendships.
Rachel was possibly emotionless because she was scared out of her wits but steeled herself to focus on surviving. She perhaps had her game face on. She also strikes me as being quite ‘no-nonsense’ and organised.
I too think she may have been tempted to take all the money if she had the chance. She has kids. She may’ve decided to put them first.