Officially confirmed that yes, Cora was Erica.
Okay, I had some people message me about this because they were confused and I’m back at my computer now instead of on my phone, so, to clarify:
Basically, the writers confirmed that Cora wasn’t conceived as her own character, but rather as a stand-in for Erica after Gage left the show. They didn’t bother to actually come up with any backstory for her or to develop her at all—either her character or her relationships with any of the others—because they were literally just writing her as Erica with a different name. The most frustrating part about this was that they said it entirely offhand, as if that were a legitimate way to write things, and placed the burden of interpreting things in a way that made sense on the fans instead.
AAAAAAAAAAND the Fuck You Jeff novel is getting much more likely…