Mmm... it's more like this:
Rei 1: Born in NERV's basement in 2000 or 2001. Survived four seconds of strangulation by Dr. Akagi Senior. Survived the explosion of Unit 00 and recovered quickly because of Uber angel healing powers (which may have been the result of Rei-Armisael fusion). "Died" in EoE.
Rei 2: Kept in the Reiquarium until 2015 or 2016, at which point it became the core of one of the two Rei-based dummy plugs.
Rei 3: Kept in the Reiquarium until 2015 or 2016, at which point it became the core of the other Rei-based dummy plug.
Rei 4-15 (and up?): Kept in the Reiquarium until Ritsuko hit the "puree" button. #4 may have been used for "spare parts" after Unit 00 self-destructed.
I wouldn't rely too heavily on the DC of Episode 24; there's some stuff in there that causes contradictions. For example, when Rei is wondering "what did kaworu mean when he said we were alike?," that scene kind of doesn't make sense after the addition of Kaworu saying "Hey, guess what? You and I have the souls of Lillith and Adam, respectively! Isn't that neat?" Similarly, it doesn't make sense for Kaworu to mistake Lillith for Adam after SEELE tells him outright that Adam is in Gendo's hand.
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