Tbh if it came down to it eliot, Margo, and Quentin would kill literally anyone but one another to save even one person in their trio.
Quentin killed the woman he loved without even thinking about it because Eliot and Margo were in trouble.
Eliot tried to kill the most dangerous creature in the world to keep Quentin. Even got (a clay) version of himself killed to save Quentin.
Margo was willing to trade away a baby to save Eliot.
They will all do anything and everything they have to to protect one another. Even if it means they’re the last ones standing.
So long as it’s all three of them.