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Thawne kills Nora. Barry gets his powers 7 years earlier.
Yes.
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Our Barry travels to earth-2, earth-x, earth-39. Becomes friends with beings from earth 19 (Gypsy, H.R. Wells), and whatever number earth Sherloque is from. He and his team get advised by a council of wells from numerous realities. To further his agenda to mess with our Barry, Oliver, Kara etc the Monitor slaughters Earth 90.
Yes.
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All of this because Eobard messed with the timeline. Those realities have now been disrupted because our Barry got his powers earlier...not because of the Barry in their own dimension...just because of Barry from earth 1. He and Eobard have changed all of these timelines...we know that because original Barry didn't go to any of them because he didn't have his powers yet.
No.
Thawne didn't 'mess with the timeline'. He created a divergent reality. That's the key. No timeline has been changed. The 'original' timeline (where Nora lives) is still out there, unchanged. And whenever Barry or Thawne have travelled back to the past all they've done is created more divergents.
You're right, 'original' Barry didn't go to any of those Earths. But divergent Barry DID. From the viewpoint of someone living on Earth-39, divergent Barry is the 'real' Barry. You could follow that timeline right back to the Big Bang. Barry's appearances on these Earths is just part of the natural order for them.
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So yes considering Barry and Eobard have caused this much change on a multiversal level...I do think they have caused another Crisis. The original Barry saved the universe (or multiverse). That's why he disappeared...just like in the comics.
If this is going to be anything like the comics, then there's only ONE Crisis event, caused by the Anti-Monitor.
I wouldn't be at all surprised if they pulled some guff with Barry dying in 2019, but still existing as a 'time remnant' or somesuch, to explain how he lives on to vanish in 2024.
Of course, it's all irrelevant if we get the announcements I'm expecting over the course of the next six months or so (The cancellation of the Arrowverse shows).