With the situation for season of the splicer coming up all the time let's explore the possibility to say Savathun is playing everyone.
What if Osiris isn't corrupted/hidden away/anything other than normal?
Let your theories fly. Mine is simple:
Savathun is a master of trickery. Perhaps she intended for us to focus on one guardian who responded to her song like Osiris and has instead been doing something behind our backs the entire time within the Vex network. Perhaps Mithrax was wrong about Quria being the center of the vex curse and she intends to plunge the last city into the vex network and reign chaos on people.
-
What if we are corrupted and this is all in out head. I mean we spend a lot of time around hive artifact that have been known to corrupt guardians, plus we are constantly hearing savathun song everywhere we go. This would explain why all the npcs dont seem to notice the endless night or the blight in the tower.