Raubahn I think kind of proved himself in the last patch.
Merlwyb is a bit more of a stretch but her intentions seem solid.
As for Kan-E-Senna, those invisible voices can be surprisingly handy and considering those invisible voices drowned Eorzea once (6th Umbral calamity) before because of the rampant misuse of magic, I think its good to have someone friendly keeping an ear out for what they are saying.
And we do trust Garleans to back us up. Cid.