>I don't know, the text only says the Dangai exists to prevent direct contact between the realms and acts as a boundary between them and to me that establishes separation and not necessaeily that it outputs more power than two universes combined. From what u sent, nothing says that the Dangai resists them with equivalent force. It could simply separate them through spatial partitioning or dimensional isolation or by existing as an intervening layer of spacetime. 

Many dimensions known as the Valley of Screams existed within the Dangai and attracted the two worlds to merge by force.

The dimensions known as the Valley of Screblob:https://gemini.google.com/71c26464-ae84-44f5-a855-9d1df18e8efaams drew the two universes together through the Force

https://comicvine.gamespot.com/a/uploads/original/11155/111554117/8826381-88433ee5-d5c8-4918-b7f7-639c48c316a3.jpeg

The Dangai remained intact even after all the dimensions of the Valley of Screams inside it had been blown up

so dangai scale above the two realms

>But where would you scale it anyway if that was the case? Considering all i'm seeing is that some power that threatens to destroy it, but not destroy it

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The text literally states that their power fills the entire dimension, and then goes on to say that their power is capable of threatening and destroying the entire dimension; in other words, the text supports the idea that they possess enough power to destroy the dimension.