I think the crash really happened, and that only the flash sideways was Purgatory, They all died "eventually", as Christian said. Some lived longer, some didn't.
Yes, the crash and the island were real. Remember Christian mentioning that they (the losties) constructed this place so they could all find each other again because the time they spent with each other was the most important in their lives.
If the crash/island was never real, none of that makes any sense, since they didn't know each other.
I found the scene where Ben and Locke forgave each other to be the most moving in the entire series.
I'm not sure I like the "flash sideways" being purgatory. I was all choked up until Christian said "You're dead" and then I wasn't really sure what to make of that. I mean, Faraday's mom was trying to keep Desmond from figuring it all out and they had all these entire alternate lives including Jack having a son. Who/what is Jack's son supposed to represent in this afterlife?
I think I'll be watching this episode again, if not the entire series. I noticed that Walt and Michael weren't present at the "moving on," nor smokey or jacob. I'm guessing Michael moved on and so did Jacob when the fire ran down. Who knows about Smokey.
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