You know... Now that I'm reading this again, I was thinking... Couldn't Negi have used telepathy with the Pactio card to ascertain whether that Asuna was real or not? Nodoka's mind-reading didn't work because the fake genuinely believed herself to be Asuna, but the Pactio card that Negi has definitely isn't linked to the fake, so there was no need to fucking steal Fate's girl. Poor guy already has so few compared to ChadNegi, it's kinda sad at this point.