Re: What do we do?
You've been off the mat for ten years and don't recognize the chief instructor's name? How strange. Visit his dojo and inquire about his lineage and bona fides. He could be entirely legitimate and he could be a fraud. That you didn't find anything published about him means simply that you didn't find anything published about him.
Inviting him and his students to your upcoming seminar would be a good way to meet a new instructor and make new friends. He will accept and perhaps you'll find a kindred spirit. He won't accept and you will have done all you can do to build a bridge.