Could this not be a KKG but rather a new Element in itself?
Anti-matter? Here are a few things you should consider.
1) Anti-Matter is matter, but rather than their atoms having an Electron like matter does, theirs have what is called a Positron, its like Bizzaro World. But the important thing is that it is Matter with an Opposite charge, and Opposites attract. Which could explain how Chibaku Tensei works.
2) Anti-Matter again has the Opposite Charge as Matter, and What happens when a Positive meets a Negative? They cancel each other out, Which is what happens when Anti-Matter and Matter come together, they both cease to exist. Which explains why Obito's Anti-Matter Release de-materializes everything in its path.
3) I am still not sure how he can control the attraction of the Anti-Matter, As even Nagato showed when he used it, while the Anti-Matter was in his hands it did not attract anything, it was only when he released it that it began to attract matter. But this is probably done with Chakra somehow, the same way Juubito controls the Shape and Size of it.
But check this out
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"- Yes. For storing small amounts of energy in an extremely compact way, antimatter is very useful. The energy density stored in antimatter is about 1 billion times higher than in batteries.
- But: the amount of antimatter that is produced each year in big accelerator labs such as CERN or Fermilab corresponds to an energy that would allow a 100 W light bulb shine for 15 minutes. "
It seems that Anti-Matter can hold a charge much like a Battery but about a billion times higher, which means you can crank up its attraction to the matter around it, or even turn it down, if one knew how. I believe Obito and Nagato do.
4) I believe it takes
alot of chakra to upkeep these Anti-Matter Balls/Material, which is why we dont see extended use of the Technique by Rinnegan users, It took nearly all of Nagato remaining strenght just to use to form the ball.