Uh, by the time I read something about Gula I realized it was a spoiler. SEPH WHY.
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Well even if the end of the world was inevitable, chances are Gula just wanted to put off his own demise for as long as possible. Getting killed isn't very pleasant, after all.
I'm still in the camp that the "traitor" isn't necessarily a treasonous backstabber, just some bloke who (wittingly or not) fulfilled some important criteria to start an apocalypse and basically "handed over" the world to destruction. I mean, if we're going off of the missing page's words (which, iirc, never even MENTION the word "traitor"), this person's someone who loses faith, goes off on their own, and eventually strikes the war bell. In other words, until further notice, I'm assuming it's Ava.
We don't know how long it took for everyone to get to the Badlands after the bell started to ring. For all we know, it could have been immediately, or the Foretellers might've had some time to run about and yell at eachother.
I can't help but wonder if the bell is the actual causus belli, or if it was a correlated event that could be used to mark the start of the war. And if it was the former, whose dumb idea was it to make a ringing bell THE signal to start an omnicidal battle royale?
Hah, I get the feeling that whoever wrote up the scenario for the Keyblade War scene was not going for military realism in the slightest. That being said, I always pictured the KBW as a chaotic free-for-all, so this pmuch matches what I've imagined it would be like. Good thing dead bodies seem to disappear into light, too. No one will be tripping over them or slipping in their blood. 8D