With all the lore bits that humanize Savathun’s character, I wouldn’t be surprised if Savathun turns out to be an ally against the Winnower. One part that has me partly convinced is one line from Osiris at the end of an Expunge. Osiris asks Mithrax “You would join hands with Savathun?” To me this indicates a moderate interest from Savathun, as if it’s a concept she never considered possible. Especially considering Savathun seems to be behind on everything. She seems to marvel at what she learns while living among us in the City.