I don't think the old man is the real boss. I mean it seems to be a bit too easy. Maybe there is a shadow shogun of EU hiding in the shadow.
About the ability user, I think I've read somewhere about his ability being a passive type compared to others which are active type. What I mean is that his is more of the instinctive ability (super enhanced version) type while other people are the kind which can be freely activated according to will and no need to resort to special tricks Kana style.