Hmm...if we're being stranded on an island, I can see the benefit from three of these girls:
(1) Olivia could have the scientific knowledge about things like the weather, the tide, and determine our location by navigating the stars OR if she has Zobo with her (who can turn into a drone), she could just have him fly off to the nearest help with a distress signal.
(2) Mia might know some survival skills since she's a nature girl after all. She would know what is safe or unsafe to eat, what animals to look out for, and how to treat injuries caused by nature. Her father is a wildlife ranger although I don't know if that comes with knowing how to survive in isolated and/or extreme climate areas.
(3) Stephanie can be very resourceful. From what we've seen, she is a highly cautious person, and always planned ahead in case of emergencies. You can bet she has a lot of equipment on her so we would be able to live a bit comfortably instead of completely roughing it out in the wild while we're trying to figure out how to get off the island.
As for Emma and Andrea, even though I like them both a lot, I wouldn't count on them to know what they're doing. Andrea is too much of a city girl to care about survival (and would probably complain the whole time, let's be real) and Emma, while she'd try to make the best out of the situation, has no experience or prior knowledge about this either. Getting stranded with either of these girls means you're screwed, or you'd have to be the one doing most of the work.
