I wouldn't call the harvesting souls a maternal sacrifice so much as Shinji attaining the power of a god and using it for his own selfish ends...which is just the same as what the climax of 2.0 shows.
But Rei played a key role in both of the events and was the active in EoE, Shinji just gave the consent, he was neither a god nor in control then. 2.0 was at least on a superficial level, reversed.
By the way you came up with a much nicer explanation for the R/S role/plot device than I would have used.
Incidentally, what do you think of the idea of Kaworu as a mother figure?
Well, he was a mother in a past life, and goes through the trouble to mention it and yes, I think you could see some of his actions towards Shinji as being maternal. Although he simultaneously serves as a masculine presence around Shinji, in Anno’s words an “Idealized masculine counterpart to Shinji”. That seems somewhat contradictory and ambiguous, but when you look at his character, or any of the protagonists and their roles, contradictory and ambiguous define them. Kaworu’s less than seamless angel/human dualism right back to the “boy with cat” idea fits this too; I wonder if Asuka won’t be playing that part in some form now... In a much diffrent way that is.
contamination made by the Angel, or something like that. I'm not quite sure what the exact line is.
That, and the fact that she’s in a containment chamber rather than an ICU, which kind of indicates that it isn’t physical injuries they’re worried with. I’d say that it’s pretty significant that she’s surrounded by miniature suppressor obelisks, which have only shown up around quarantined Shogoki in the trailer, and angel samples, oh and her room and wire arrangement looks quite a bit like Tuniel’s. Add that to the concepts detailing Bardiel combining with her(face) and yes, I’d think that it’s reasonable to assume that Asuka was contaminated. Given the apparent lack of injuries shown in containment and preview it’s probably not hard to imagine that what is under the patch ties into the idea of Bardiel bonding to her face.