Regarding to todays chapter I have come to an obvious conclusion that Kamui is nothing more than a sealing method; Fūinjutsu. This will be a complex theory, nothing non-understandable.
Alright firstly I want everyone to take into account Totsuka Blade, this weapon's ability is quite similar to Kamui's sealing methods, and here is why:
Alright, now Orochimaru was sealed within that "Dream-Like" dimension in which Totsuka sent the victim to for all eternity, basically a Dimension of dreams. However, to escape that dimension Orochimaru was revived via reverse sealing:
Now what Totsuka Blade's ability, and Kamui had in common was that Kamui was also seen to have a dimension itself:
Alright, now that the similarities are compared, you all must know what Fūinjutsu is:
Fūinjutsu (封印術; Literally meaning "Sealing Techniques") are a type of jutsu that seal objects, living beings, chakra
, along with a wide variety of other things within another object
. Fūinjutsu can also be used to unseal objects either from within something or someone
Pay close attention to the underlined context, as they will prove how Kamui does indeed branch into the Fūinjutsu category.
The first underlined context reads "Jutsu that seal objects, living beings, chakra etc." As we've already established Kamui's ability sends the person/object into a dimension:
The third underlined context reads "can also be used to unseal objects either from within something or someone." This has also already been shown within the manga here (revert back to chapter 598 pg.4 to see the whole panel):
I didn't quite go in order (skipped over the second underlined context) and the reason for that is because the second underlined context is the most important into believing that Kamui is Fūinjutsu. The second context reads "within another object.", now where have we seen that? Exactly, in today's chapter.
Take notice of the Jūbi being sucked into Kamui. Take note that the Jūbi is nothing but chakra, something that the first underlined context was said was sealed within Fūinjutsu.
Then moments later the Jūbi was transported (and sealed) into Obito:
Kamui = Fūinjutsu | Naruto Wikia, and Narutobase RP need to add this as its new classification. Hope you all agree.