User blog comment:Mr. Youtube/Columbia and Rapture/@comment-24.218.128.253-20130417025010

I think that in the universe in which the original Columbia exists before Elizabeth opens the tear to save mr Lin it continues to prosper and grow giving ideas to people in the future but in the world where mr Lin is alive but remembers he is dead and vox populi don't have the weapons yet the ideas are only getting darker and that a child in Columbia notices the horrible ideas and the failing ways of the prophet and decides to make a city in which there is no religion and be as far away from god as possible and create rapture. At the end when Elizabeth kills songbird she didn't open up a new world but and old one that was fast forwardiing in time when that child created rapture. This means jack would have never came to rapture if it weren't for Elizabeth even being alive. That also means booker and jack are in the same universe in which rapture and Columbia exist and if comstock and Columbia didn't exist then therefore, rapture does not exist and neither does Andrew Ryan. It only exists in the universe in which the vox destroy Columbia meaning the entire bioshock universe would not exist if not for one thing, a city and a lighthouse. I feel that infinite was the conclusion to the bioshock franchise because it explains everything and why it all happened in the first place and why it couldn't happen again if booker was not killed before any of it happened and before he found out about the city and lighthouse theory meaning that the circle was finally broken.