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I'm happy to see him too, though I'm still not to sure about Kamui. [After all he did make Subaru cry!]
As for the other, I don't really know. The person that said he knew him did introduce himself as Kamui, but he doesn't really seem that bad. He's been polite and kind each time I've met him. As for Kakyou I don't see him doing something like that. I met him in a dream actually, and he seemed kind of lonely.