If this has been covered before I'm sorry. From the ways we are contacted to re-enter the infinite forest, to the things they say while we are there leave me wondering if the Osiris and Sagira we talk to are even the real thing. On the strike playlist is a mission to stop Cabal who are entering the forest and causing havoc looking for the map to use for their own ends. We receive a text transmission instead of hearing from them directly, but once in the forest we talk to them over comms. I think they are unable to simulate them outside the forest. The next clue was Osiris' amazement that our ghost could simulate a sparrow when sagira did it for us during the story mission. Also I feel that Osiris would know what a ghost could do. None of this isn't to say that they aren't alive and real, but often I feel the missions we get are tests being run on us and how we handle the different enemies.