UssGlenn wrote:

The Klingon War timeline is the original timeline. The Enterprise C disappears and history continues without interference to the war outcome. Then it appears in the future and is sent back, creating the history we all had been watching on TV.
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That's how I'd think of it too, except it doesn't explain the visual shift at the beginning, nor Guinan's knowledge of the TNG history.
This episode reminds me of "Yesteryear" - good, but the time travel makes no sense whatsoever.