I think we rescue Osiris(maybe a little scarred) at the end of the season. I also think Sagira is Savathûn’s personal ghost and we have to rescue her to stop her from reviving Savathûn.
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Given Sagira's shell absence as a death, I think it is her in the "sleeping" phase, and the pyramid has ghost in it's "sleeping" phase. Not sure when ghost will see the traveler as small or tiny...either way I am pretty sure it's a simulation, and our Destiny is, hopefully, going to cause or define freewill as a form of paracausality.