When they ended up on Rapture...my brain wanted to explode.
If Booker/Comstock is also Jack/Andrew Ryan I wonder who Elizabeth may have been in that alternative world...the little girls?
The vision of the different versions of Elizabeth at the end when they are drowning Booker, reminded me a bit of the ending in Bioshock where if you choose to save the little girls you see many of them around your bedside when you die of old age. Sad that by killing Booker/Comstock....Elizabeth and all these other versions of her will no longer exist. By killing him they were killing themselves as well. What a sad ending...I wanted to see them go to Paris.
It was also sad for me when Songbird died. That bird was cool as hell.