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well i suppose that it's related to the number of souls they destroy, i think that akuma only start out being residual human souls, as in the human soull is just a base ingredient and as it evolves it withers away, take for instance the level 4, allen said that he could barely even recognize the human soul inside of it, so maybe as they destroy more humans, they get more comfortable in their akuma existence or something to that extent.
maybe its to create more Noah
Noah are really strong so where do their power come from?
Maybe all those souls gathered up together eventually make Noah
What if the Earl needs more akuma to awaken more Noah
it could explain why he is so eager to create more akuma, so his family can be united again
Since Noah is the ancestor of all humans up to now, maybe all the souls in the world were once one and the Earl just wants to gather them up
hope hoshino reveals more
Well, Mention by Lulubell and Earl in Episode 103, it seems Akuma doesn't evolve like a weapon, which Allen and the Black order assumes...
It seems the Akumas evolve for a more unexplainable reason...
My Theory is... Akuma exist to fight and to ease their hunger...
It seem as the Order/Allen get stronger, the Akuma themselve evolve to get even stronger...although they mention it was not as a weapon, it seems Akuma has a greater meaning in existence, it something to do with the end of the world...