>>2242538Things like Angelic Days and other spinoffs are Rei in the sense that the character represents NGE Rei.
There's one Rei Ayanami, one character, one take. But in the Rebuild spinoff, there's the Rei we know from NGE +/- some different development/changes, and then there's a plus one named Rei Q.
So we have two, and only one is Rei Ayanami, where Rei Q is not Rei Ayanami.
It's not confusing, and the argument isn't based on not liking Rei Q, it's based on the fact that they're two distinct characters within the same story and plot where none continue the other.