Chaplin
Better off silent
I don't even know what this means. Do you believe that they're lives were exactly the same but on the flight somehow it changed? Not sure how that makes any sense, nor why the writers would do that. What do you mean their histories are fabricated?
really? I think every flash-sideways is overwhelming proof that their lives and probably everyone in the world had their lives altered due to the explosion because of the butterfly effect. I mean... I really don't get what you mean by fabricated. Maybe an explanation of that will bridge the gap here because I can't figure out what you're talking about.
Each character has a "history" before the Oceanic 815 flight. But are those "histories" real, or were the planted in each character?
Say we consider the 2007 island stuff to be the "main" timeline. At the end of the series in 8 weeks, the MIB (or Jacob, or whoever) gives everyone a "do-over" starting on the Oceanic flight in 2004. So in theory, that timeline actually starts in 2004--and the stuff that happened to all those characters BEFORE 2004 isn't real, it's all false memories given to everyone to shape their "new" lives.
Overthinking? Absolutely. But implausible in the world of the show? Hardly.
Remember, this is one theory (albeit WAY out there) amongst many, many theories. I'm not claiming I'm right, I'm just throwing stuff out there. Didn't mean to offend anyone.