You said that ginkakau and kinakau were fighting for the cloud, and I'm explaining to you that they didn't because they attacked Ay.
I'll tell you why this scenario here doesn't work.
1.One thing you need to realize is that the conference was not about the first world war, it was about the end of the feudal era in which Hashirama was dubbed god of the shinobi because he was given credited for creating the Naruto current shinobi system.
2. If the conference happened after the war, Hashirama would not split the bijus up. In fact Tobirama would not let him. They would just use that as military might against Hashirama destroy the leaf entirely. He wanted peace not war.
3. The First world war had both Hashirama and Tobirama in it. But d you know what else? It had the 2nd Raikage as current kage of kumo at the time. So your perceptions is all wrong. How can the first gokage conference happen after the first world war when 2nd Raikage wasn't even kage yet?
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I have so much more facts too, but this should be enough to understand that your order is wrong.
Of the feudal era