Anna/Elizabeth had to drown every possible multiverse version of Booker in the creek before he either became baptized, and then became Father Comstock, or ran away and stayed Booker. But the end results are always the same, as she says to Booker earlier (later?) there's always a man, there's always a light house, there's always a city." Even the underwater city of the previous Bioshocks was affected by it.
The Letuces showed over and over that even when it came to random decisions, Booker would always do the same thing, but due to the effects of having multiple memories from the same place, and due to his horrible guilt, Booker could never reconcile this, suffering nosebleeds as a manifestation of it. (Whereas Father Comstock never crossed realities but was sterile due to the radiation from the early Letuce experiments.)
The end is curious because it might mean that there is at least one Booker Dewitt left, and perhaps this one never sold his daughter. It's left for the viewer to decide, like that spinning top at the end of Inception.
The Letuces showed over and over that even when it came to random decisions, Booker would always do the same thing, but due to the effects of having multiple memories from the same place, and due to his horrible guilt, Booker could never reconcile this, suffering nosebleeds as a manifestation of it. (Whereas Father Comstock never crossed realities but was sterile due to the radiation from the early Letuce experiments.)
The end is curious because it might mean that there is at least one Booker Dewitt left, and perhaps this one never sold his daughter. It's left for the viewer to decide, like that spinning top at the end of Inception.
