It's straight in the proposal:
from the translation in our own wiki wrote:Exclusive operator of the giant humanoid weapon Evangelion-00
Member of ground crew in the beginning due to injury sustained during first battle.
Specially educated and trained the same as Asuka.
Lacks emotion and speaks few words. Nihilist without feelings.
Learned about emotions and feelings after falling in love with someone.
Important secret behind her birth is hidden (she has no parents).
For Pete's sake, in her death scene she says that "her heart wishes to be one with him" & associates this with the image of armisael taking her form & pulling EVA 01 into that grotesque parody of a suggestive embrace.
Given something that blatant (as well as several characters bringing up the possibility in-universe -the same thing that is brought up as 100% ironclad evidence that LAS is canon) it seems very far-fetched to state that fans are "just making it up"; Not saying that that's the only possible interpretation but is NOT an especially far-fetched one.
It didn't really go anywhere because the plot puts a stop to any homeroom drama elements before long, but they were there to sort of represent opposing but equal forces in the psyche, and not just a simple binary contrast either where one is "all good" or "all bad".