User blog comment:TheBlueRogue/Bioshock Infinite DLC: Clash in the Clouds released, Burial at Sea announced/@comment-124.170.13.126-20130801220605/@comment-4959479-20130803160148

I think this alternate Booker was simply born later. Alternatively, he was sent through a tear to 1958 or earlier and no longer remembers. I suspect this Elizabeth traveled through a tear to get there anyway.