User blog comment:Zathronas/Speculative Author - Cinder is not the Main Antagonist/@comment-16241789-20160203063149

There was an interesting bit of the conversation in Chapter 3 between Qrow, Glydna, Ironwood, and Ozpin that also supports this:

"Your little infiltrator isn't just another pawn; they're the one responsible for Autumn's condition."

[...]

"You think they're scared of your little ships? I've been out there and I've seen the things she's made, and let me tell you... they are fear."

"And fear will bring the Grimm."

I thought these snippets were interesting for a few reasons. First off, Qrow refers to Cinder as "they", implying that he doesn't know her gender (while it may be argued that he does in fact know her gender due to being at the scene in Chapter 7, it wouldn't make sense for him to not refer to Cinder as "she" if he did; Emerald's illusions might have prevented him from being able to tell). However, later on, he refers to a "she" creating "things" out in the field (it's also interesting to note that these "things" aren't Grimm; otherwise Ozpin probably wouldn't have referred to the Grimm as an effect of these "things"). So this implies that the infiltrator responsible for Autumn's condition (Cinder) and whoever this "she" is who's creating things are two different entities.

Unless I missed something, which could be entirely probable.