No he kamuied his hand to be kamuied whole.Probably he can, He used kamui on himself, and he can't see all of his body. So I think this is the proof, right?
I don't remember showing him kamuing his hand first, but still, that is just part of his body, not his whole body, so even kamuing his hand first, he would have to see his body, which he didn't.No he kamuied his hand to be kamuied whole.