Interesting idea, though one thing I should point out is that the mechanics of the clan are always evolving as the manga evolves; Keigoku in it's simplest form is Bijuu chakra, or more specifically, Juubi chakra. Initially, it was though that this chakra only existed as a legend and deity like entity that didn't exist anymore. We later learned that this is somewhat true, except now everyone has Juubi chakra ( more or less, anyway ) and that it is the true primordial source of chakra. I'll explain more below.
Nice, nice. Keigoku isn't treated as Natural Energy, however; it can be seen as a form of Bijuu chakra that has special intangibility abilities.
Yes, everyone's cloak holds the same level of power.
Pseudo Jinchuriki, I like that. More or less, it's something akin to that. Nice lol.
Well, the explanation that me and Dork created through a series of talks early last year is related to Yin and Yang but not directly. Below is an excert he wrote about Keigoku:
The portion in bold is something that that is very noteworthy and should be remembered; it forms the basis behind the Irish reasoning of the clans inner workings and the separation between Juubi Malleable Chakra ( or as we dubbed it, JMC ) and Keigoku. Now, adding on to that bold portion. Keigoku can indeed be viewed as an altered form of the JMC that is canon. As per definition, Keigoku is a space/time utilized chakra source, using it through summoning. A sort of "yin summoning" one could say, somewhat a mixture of Space/time with Yamanaka traits to put it loosely. Now,
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refers to the spiritual energy that governs the imagination and the ability to create things from nothingness. Utilizing this with our form of Juubi Chakra as well as space/time ninjutsu, we are able to create a gathering and manifestation of Juubi Chakra from nothing (or, in terms of the RP, the Juubi's vessel on the moon) that we "teleport" to the fields we are in battle in. Due to this utilization of Yin release along with it, it gains a spiritual aspect to it, one to allows it to affect matter on a spiritual level, which in turn is why it has a level of intangibility to it, being able to bypass through things with a spiritual part of them, i.e. sentience. Now, the canon chakra that the Juubi uses in the manga, and by extension that Madara, Obito and the Sage of 6 Paths uses, is similar yet different than our chakra, as Randy stated above. Both have destructive and corrosive properties and the easiest way to explain this would be to simply separate one as the Yin aspect of it and the other as the Yang aspect of it. While this can be seen as true, I believe it to be somewhat different. While Keigoku
can be seen as the Yin natured Juubi Chakra, I think the properties of the JMC is inherently different. A key trait of the JMC is it's ability to affect both living and unliving matter, something it has shown in multiple instances. This chakra is also the same chakra used by the Sage to split the Juubi himself into 9 different beasts, using the Creation of All Things, implying that it is both a yin and yang based attack, furthering being implied when it was mentioned by Tobirama of being a yin and yang natured attack, hence why it was able to negate all ninjutsu.
Now, if we accept this as being fundamentally correct, it leads to an issue: If we have a full yin and yang JMC source and derived from it comes the Yin based variant, then wherein lies the Yang variant? In all things there exist balance, more certainly when speaking of bijuu and the concept of yin and both yang. This train of thought leads me to view Sharingdork's original definition as both true and false. While it has the potential and can possibly be the Yang version of our Keigoku, JMC fits more so as the "perfect" chakra source, afflicting both spiritual and physical damage, hence why it is able to completely destroy edo summonings as it deteriorates both the spiritual and physical links that anchor those souls to our plane, which is the logic I based my own Nekura custom on. Now, this brings up a small issue of conflict as there can be two ways to view keigoku:
1. We accept Keigoku as a Yin natured variant of this, and JMC being the ultimate source, which we likely wouldn't reach due to missing the Yang variant and ponder more question on what
would be the Yang variant. With this method, it leads us to question what exactly a Yang natured variant of Keigoku could encomporate, likely a form of jutsu disintegration maybe or physical bodily damage through contact, though not on a scale shown when Minato's body deteriorated from contact with the JMC.
or
2. We accept Keigoku as a Yin natured variant of JMC while we view JMC as the Yang variant, although it is stated to be the utilization of both yin and yang, as well as Juubi chakra. We would view it as such to make our own explanations of Keigoku to be in simpler terms, though still incomplete using this method.
I myself am more inclined to view the first one as it seems the more likely and fits closer into the realm of the manga, though we shouldn't even have to worry about manga conceptions with anime conceptions as we are first and foremost a custom clan, meaning everything of our abilities should be custom and as such, canon related realizations shouldn't affect us but I digress..on to the concept of tangiblity.