I like the theory, actually, very, very nice job.
I agree completely, I think he has the same ability as Kankorou and Chijo, strings. Strings that are invisible and doesn't attach on the human body, but instead attach against or into the souls, hence being invisible. But I also think that he can somehow sharpen the strings and cause them to slice human their souls, however I think that when he slices the soul that then his own flesh wouldn't get hurt but his soul, meaning that he will get psychically attacked, having pain in the brains and not his own flesh, so I agree with everything, except for the part of when the soul will get sliced, his body, so his own flesh also will get sliced.
However, once again, nice job, and Rikerslade, your opinion is useless and not needed, I completely disagree with you and instead of giving a three/four words opinion than try to give a full description like Knight did, put effort in it or else stay away from the thread.