Nice to see you here, kiki!
Idk, I feel like the move has both pros and cons.
Obviously the tribe lost a valuable challenge performer and Phoebe should know that at her next tribal council she will be in the minority again and with no idol to protect her.
But, if Vavau have run out of of hopes of winning immunity, the decision might not look that bad. I felt like Craig was the glue holding the alliance of Vavau together. He loved Sue and had a close bond with her. Kate and him flipped to vote out Andrew, so there must be trust between those 2 as well. The Aganoa girls might have been hoping that with Craig gone, Kate/Conner would be open to working with them. (I'm not including Sue because we never saw the girls trying to develop a relationship with her.)
BTW, I think this improves Jennah-Louise's chances a lot, as many people were seeing her as a tight duo with Craig, and since he's gone, Jennah is much less of a threat.