Good Problems.

Having one Origin used to be the foundation of their strength and the source of their uniqueness. But it has created a problem for Legion. They will all have to become world gods or advance to that level of power so that they will be able to exist side by side and not overwrite each other. Then Legion-7 will have to fuse with all of them at once, immediately after they have all become world gods. 

To top it off, they still don't know how to make Aeternus become a world ender. Comprehending the Supreme Law of Chaos is a no go for them. If they can't become world gods, then they don't dare mess with true chaos. Especially not when they have seen world gods give them a wide berth because of it.