Databoook clearly explains how Kamui Raikiri works. Everything except Kakashi hand (hand that is performing Raikiri ) becomes intangible.Raikiri pierces opponent and sends pierced part into Kamui dimesnion, while Kakashi intangible body passes through opponent body.
Why are you surprised it was already shown that Obito can make intangible any part of his body he needs while leaving rest of his body solid. So why cant Kakashi make every part of his body intangible except his hand which performs Raikiri.YOu dont need databook to realise this is possible you only need logical thinking.
Except it was never stated that RSM requires having hagromo chakra let alone half hagromo chakra. I mean it has been never explained how RSM works. All we know that it is a gift from hagromo.the only thing that was shown in manga is hagromo handing Naruto and Sasuke the moon and sun seals. Then Naruto was shown with developed SM which is known as RSM and Sasuke was shown with developed eye which is Rinnegan. You cant assume that they have directly received permanent half hagromo chakra each specially that the seals were proved to contain hagromo chakra.them having half hagromo chakra is a theory at best. And even if they do have any amount of hagromo chakra, there is nothing to show that they have half hagromo chakra each.Right.. You said he doesn't have Hagoromo's chakra. He can't use RSM without have Hagoromo's chakra.
I dont see how kakashi using long range kamui or kamui raikeri while being Intangible will be overwhelming to Kaguya, JJ Madara, JJ Obito or Naruto Specially with intel .No one has shown the ability to match a character with such power.
That's impossible, and you don't need the Databook to realize this, only logical thinking. Kamui does not allow you to make only certain parts of your body tangible. It works by unconsciously sending any volume crossed by something in the current dimension to the other one.
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The only thing Kamui Raikiri does is send the volume pierced by Raikiri to the other dimension. It does not make only the hand tangible, as that has already been described as impossible. It's the exact reason why Obito lost to Minato.
You are partially right. Kakashi cant select certain parts of his body to be solid while using intangibility.the thing is Kakashi's whole body, including his arm, becomes intangible while using kamui raikeri.kakashi doesnt need to be tangible in order to:
1-create and hold tangible Raikeri in his hand 2- stab the enemy with said Raikeri.
1-Kakashi doesnt need to be tangible in order to hold Raikeri because he doesnt hold it physically . I think this should be clear.
2-Kakashi's arm doesn't need to be tangible in order to stab his enemy with raikeri because his arm doesnt actually overlap with the enemy body, the raikeri coating his arm does.
He doesn't pick what becomes intangible while having it active. The parts of his body that overlap with something else are sent to the other dimension. That's all there is to it as has been shown and explained by Kakashi. His body will still exist in the current dimension if nothing is overlapping with it