There was another good post after the experienced points column about infinite explaining that.I.Muir said:Some of the mechanics they use to present the story I feel don't really work and it bugs me as much as time paradoxes. That being said I had a lot of fun playing it be more fun even discussing it with others and come to the conclusion that it tried to tackle theories it did not really understand and failed.
Mostly about how constants just do not fit in with multi verse theory at all. Liz suddenly becoming omniscient and some details about Booker being drowned. For instance: Liz drowned Booker thus removing Com-Stock and causing her to cease to exist. Why then wouldn't those events just loop anyway since she never existed to interfere with them.
Still good try.
I will try to recreate it, but if it doesn't work, go there.
So, in the End, after the cutscenes, you shortly play a few seconds of broker again, so he seems to be alive.
For clearance reason i will here refer to Anna and Elizabeth as two seperate persons.
In every Universe were Comstock comes out of the Baptism, he will steal an Anna from another Broker, thus creating an Elizabeth, which will consequently go back in time and kill all brokers before the baptism. But when Comstock isn't there, there also was no elizabeth to drown him so he does survive. Therefore: Any Universe that creates an Comstock, will also create an Elizabeth and therefore erase itself. Any Universe that makes Broker refuse the baptism, doesn't create Comstock, doesn't create Elizabeth and therefore stays in existence.
This way only the "Brokers" of the multiverse survive.