I think that Rousseau and Karl are dead. We finally got to see Miles in action which was kind of cool. I wondered when he would start to hear the whispers. I do think we will see more of Rousseaus story through flashbacks.
I don't believe though that Keamy and Gang are the ones who buried them. Mercenarys are not going to take the time to bury a kill unless its one of their own and even then Marines never leave another Marine behind. I like to think that the island is swallowing them.
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