I find it very unlikely that Savathûn used Osiris without having influence over him, that’s assuming she’s not wearing an Osiris suit like a skin puppet.
Before Season of the Splicer maybe you’d have a case, but this Season Osiris has made a clear attempt to play every side in the political turmoil of the Last City and gone behind the backs of both his partner Saint-14 and his student Ikora.
Honestly the fact Ikora didn’t go to Eris, likely because of her involvement with Stasis, is going to end up being a critical error.
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She’s in the city, in the form of someone everyone trusts and accepts, it’s in the lore. My guess is on Osiris. This weeks Expunge was very telling. “I underestimated you guardian. I won’t make that mistake again...” Very suspicious. As was his amazement at seeing us defeat Quria.