funny that you dont like paradoxes, when ever before twisty mctwisterson, the game was about time travel?
feanor, pc.
Multiverse theory! all universes have a man, a city and a girl- I think liz says this when you first see rapture.
When booker accepts the baptism after wounded knee, his "reborn" self becomes comstock.
Comstock wants "his" daughter back, anna dewitt, to basically succeed him in columbia and pwn the world so uses the Lutece's (who are the same person, from different multiverses) tear research to find her, and take her back. This causes a time loop where in every universe, this happens.
The lutece's want booker to get elizabeth/anna back to stop the world pwning to happen, so comstock kills them- they want to stop comstock from existing so neither of those things can happen.
Booker wants to smother comstock in his crib- this is drowning him before he is baptised.
The Lutece's have sent hundreds of booker's into columbia to try and do so.
Book is also jack from bioshock, and comstock is ryan- so the same character is the antagonist and protagonist of both games. Elizabeth/anna has become the little sisters.
The songbird is created using big daddy technology (says so in a voxophone) and I think might be another booker... or maybe elizabeth's mother?