Yep, disagree with 4-A Chaos
This is the main point of contention in my opinion. We see stars, but are they really a part of the dimensions? Chaos, for example, was said to be born in some isolated place among several, several stars. Plus, with all the showings of places like the Demon Realm (I've been trying to find as many as I can). It appears more so that the moons and all that are things that were already present, with the Demon Realm being a planet amidst those things. Seems more like 5-B with Creation for me.
Going off of this, given Chaos' use of this energy, I think he should get 5-B with Reality Warping. This is kinda like the Shiki and Pain examples you used, if I had to draw a comparison
Yeah, so 5-B with Creation (or something like High 6-C, 5-B with Graces)
I'm neutral on this one. I can see it, but it's also rather unknown how long it takes.
Big disagree with Purgatory being infinite in size.
So, my actual verdict is Chaos getting 5-B with Reality Warping and Supreme Deity/Demon King getting 5-B with Graces. I can see the arguments for High 4-C, but based on what I'm seeing, it appears to me that the sun/stars and that were already existing, with the Demon Realm simply existing amidst those things.