Ok this is just a theory that I put together using the patterns of communication seen in the Naruto manga. This theory rides on one of my earlier theories that was posted earlier about the Limbo world and how the Naruto characters have interacted with it throughout the series. (
I believe each character has their own unique Limbo world with their own consciousness attached to that world. Other people have been seen entering that world whether it is Naruto talking to the Bijuu or Obito seeing Rin. I believe these meetings take place in their own world of limbo.
Obito however has a unique ability to transfer dimensions which allowed him to leave the limbo world where he was with Rin and join Kakashi's right after he died.
When he joined Kakashi Obito must have gave Kakashi his chakra just how the sage gave his chakra to Naruto and Sasuke. I believe that Kakashi getting sharingan is a bit of an ass pull but still believable.
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)I believe each character has their own unique Limbo world with their own consciousness attached to that world. Other people have been seen entering that world whether it is Naruto talking to the Bijuu or Obito seeing Rin. I believe these meetings take place in their own world of limbo.
Obito however has a unique ability to transfer dimensions which allowed him to leave the limbo world where he was with Rin and join Kakashi's right after he died.
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