Originally Posted by kael03
Kamui has never been shown, or implied, to be affected by Hashirama's DNA or chakra.
It's been implied that Obito somehow used Kamui to escape being completely crushed by the rocks in the cave-in, and that was before the Zetsu graft. He hasn't shown any use of it since that time during this flashback.
Edit: to a statement in the OP about Obito viewing Kakashi stabbing Rin via his remaining sharingan, that would be false. Obito saw it through the empty socket left by giving up his other eye.
1. True, you are 100% correct. I wrote in the OP that this was pure speculation. However, there HAS to be a reason why Obito uses his Ms so frequently without suffering any side effects, and my thinking is that, Hashi's cells have something to do with it.
2. Good point and I actually missed that, thanks for that. That puts a huge hole in my theory, damn you. Lol.
3. Ok, I can accept that as well. Either way, Obito saw through the eye he gave Kakashi and it is my belief, that this was a ONE TIME event, due to Rin being killed by Kakashi.
Good critique man. Guess its back to the drawing board