About this... there is a couple of problems.
The main point I'm going to bring up, is that just because something is referred to as the 5th, 6th, 7th, nth-number of dimensions, does NOT mean it qualifies for quantitative superiority in VSBW terms. If the actual definition of these dimensions doesn't line up with what is necessary for it to count.
For the 5th-dimension, it doesn't actually qualify for Low 1-C, since "5-D" in the AU that just
refers to past, present, future, + alternative timelines. So it would be 2-A, not Low 1-C. There is no uncountable infinity here. It seems to just be your typical infinite probabilities multiverse.
For the 6th-dimension, there is the same issue. The 6th dimension is described as being "
the past, present and future of your timeline and all of its infinite probabilities, as well as infinite parallel alternative versions of your timeline."
This is basically multiplying the previous infinity of possibilities by another infinity of possibilities. While the "5th-dimension" was about the infinite possible outcomes tied to core aspects of your original reality, the 6th dimension includes the infinite universes that are not tied to it.
So, this would also just scale to 2-A. Having an unquantifiably bigger, or even infinitely larger 2-A structure does not qualify for Low 1-C.
Having more 2-A structures, or even infinitely many 2-A structures, unless
uncountably infinitely many, won't be above a single 2-A structure in size. This is due to these structures actually having the same size as a baseline 2-A structure. (
Tiering System FAQ)
The same issue arises with 7-D, which seems to simply be the infinite variability of the multiverses themselves. "
the past, present and future of all timelines in existence and their infinite parallel alternative versions, including all infinite probabilities."
So, it is basically just an even larger multiverse of multiverses. But, this would still just end up being baseline 2-A.
For 8-D, it seems like you are trying to argue for some kind of hypertimeline that overlaps the multiverse?
I disagree with this interpretation. Your scans say that Frisk merged with the timeline of the multiverse, which allows him to see all timelines, including those that have ended.
It also explicitly says that just because a timeline ends, does not mean it did not exist in the first place. So there's no reason to assume Frisk, who is merged with all of time and space, wouldn't have access to those timelines.
There is no need for an extra-temporal dimension to exist in this case.
All of other verses, like Steven Universe and Gravity Falls verses, altogether make up an 8D structure,[37] just like five-dimensional AUs made up a six-dimensional Multiverse.[37] They collectively are also called "overlapping independent Mutliverses".[45] In short, it represents any fictional story.[45] This is supported and solidified by Ask Error!Sans which recognizes multiple Fandoms of fiction.[75]
This is completely incoherent for anything tiering related. At best, it would just mean that there are other universes/multiverses that are outside of the AUs and whatnot. There is no way to tier the existence of Fan-Fiction Universes inside of a Fan-Fiction.
9D - the past, present and future of all timelines in existence and their parallel alternative versions, including all infinite probabilities as well as other alternative multiverses, including the ones that are impossible to exist. Examples: the entire fiction-verse. If you were a 9D it would mean you can go into every single fictional story in existence, even the ones what were never thought of (and will NEVER be thought of) in first place.
Also similarly incoherent for tiering. What am I supposed to make of them saying that all of fiction is inside of their verse, in one dimension? If this was to be taken at face value, this would actually be High 1-A+, due to occupying all logical possibilities, but---there are obviously so many issues with that. Notably, it says in the very next dimension that "our universe" (the real world) is above it.
It looks like it's just infinite alternate timelines, but actually, there are uncountably infinite of them, as they come from "timeline splits", meaning each possibility at each point of time creates different timelines, and since there are uncountable infinite points of time, there should be uncountably infinite timelines corresponsing to them.
Actually, no. There is nothing to showcase uncountably infinities in these stacks. Timeline splits by themselves are not ever going to result in an aleph-1 amount of universes. There needs to be significantly more evidence to argue that. Not to mention,
each action only produces a "number" of splits, not an infinite amount of them.
This means that the extra axis is composed of uncountable infinite timelines, making it significant. Other levels would by the same principle have significant axis. As said in the very beginning, the cosmology is built on the very principle that everything is possible, thus uncountable nature of infinity makes sense. Supportingly, the gap between 10D and lower dimensions is reality-fiction one, which further supports the extra-axises being significant
A fake R>F gap does not support real dimensional gaps.