1. Divine domains don't exist in the black sky. Otherwise Gods wouldn't need the divine gates to come down to earth.
1. I think it is not quite relevant because the domain that is far beyond the sky and unreachable by living beings is called the ‘Dark firmament’ (黒穹 - Koku-kyu), and only the Sky Fortress Zeridheavens can reach it. Furthermore, it is stated that the Sun of Destruction exists amidst the Dark firmament. I also remember that before she was reborn, it was described that 'The light she released illuminated the endless dark of the Dark Firmament, enough to make it seem as though daylight had finally reached this desolate place' Therefore, I don't think it's related. And when she drew the structure of the bubble, it was written that 黒穹に『神々の蒼穹』が描き足される (The 'Azure Sky of the Gods' is added/drawn into the Dark Firmament). So, does the Azure sky (蒼穹 - Soukyuu) exist within the boundaries of the Black sky (黒穹 - Koku-kyu)?
2. Stars for sure reside in the black sky. This was established in volume 6, 9 and 10. Though, I'm curious where you find Shu's statement regarding stars not existing in the worldview and them being divine domains instead. Can you link the QnA or at least qoute this specific statement?
2. Shu mentioned it here
https://novelcom.syosetu.com/impression/list/ncode/1011477/?p=303 ,The person who asked, asked about 'star' (星 - Hoshi), not 'planet.' Then Shu replied roughly that ...光を発するもの (something that emits light). In other words, Shu's definition of 'star' doesn't mean what we think it does, but rather 'anything that emits light' That’s why he said there are no planets in the Black sky, which means it is definitely not a 'star' as we know it. (He used the word いわゆる), which I think he is comparing to our 'Real World' not the Mortal world of Maou Gakuin
3. Guess it's safe to assume that blue firnament and black firnament operates under two completely different orders. The same as the azure firnament of gods.
3. Yes, I think it is exactly like that. Anos and Misha said it is under an Order like Silver light, (黒穹には、外へ渡るための銀灯という秩序 が働いている) which is similar to the Great Order of the Chief God. Additionally, we know that <Ji Gavron> was influenced by a Great Order like the Order of 'Bullet'. So, it makes sense based on what I’m thinking
4. We also have Shu indirectly confirming that the black firnament operates similar to a 4th dimensional space, possibly 5th. That's already a good standing argument to scale it higher.
4. Alright, let's consider that if Misha said the Azure sky is within the Black sky, and Shu said the light from the Black sky comes from the Divine Realm, it would be consistent. And since the Sun of Destruction is also in the Black sky, if the Black sky is Low 2-C, that would mean the worlds in Kandaqizorte, which are infinite in number, must also have an infinite number of Black skies. Does this mean the Divine Realm resides within the Black sky? But things related to the Great Order, like the Silver light, are the Orders that the Black sky operates under. Does this mean going outside a Silver Bubble involves using the structure of the Silver light, which is an internal Order of the Black sky and that Black skies also exist in infinity numbers within Kandaqizorte? Shouldn't it be the ‘largest thing’ in the Militia World and other Silver Bubbles? I am just trying to find the logical consistency