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Diavolo's plan seems hugely dependant on all three races as a whole being individually under one definitive ruler, (Michael, The Demon King) with this being undoubtedly and obviously false for humans I really just have to wonder if he even truly understands that fact.
He knows compared to demons and angels there are a small amount of humans, but does he account for how widespread and disconnected from each other we are?
I just woke up from a nightmare that they hired Shane Dawson to be the Voice Actor for Sun and Moon wtf???