There is no doubt they will meet the other people from the back of the plane. They wouldn't have brought Michelle Rodriguez on for that small part at the airport bar if she wasn't going to appear again.
I am Lost (no pun intended) on at the beginning of the episode it seems like Desmonds underground lair has windows and light (when he is lying in the bed and in the kitchen).
Also did you notice that he was sleeping in a bunk bed? Who sleeps on the bottom? Ethan?
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