Just beat the game tonight and I've got a question. The whole "2B is an E unit that's been killing 9S over and over" really went over my head and I only fully grasped it after reading about people talking about it.
How exactly does that work? In the game itself, we don't really see her doing this, with the only two killings being the black box in the intro, and the choke out at the end of A/B.
When were these killings occurring and what context do we really have for them in the game? Were they literally "9S found out to much, so 2B stone-cold fucking kills him" killings? Why not just not use 9S models at all rather than go through that whole escort-killing process?
I think I need the plot point laid out for me.