This question is about the ending of Bioshock Infinite and contains significant spoilers:
If the baptised Booker (Comstock) is killed in the end, why don't all versions of Elizabeth/Ana disappear as opposed to all but one version remaining?
We see that all Elizabeths disappear. Except for one. She is the daughter of Booker. Booker is killed before he is baptized. Then how can she even exist?