Well, I don't know about claiming to be an expert, but, I did write this:
http://www2.xlibris.com/bookstore/bo...p?bookid=38459. Yes, there was a real Koga-ryu, well documented in history. That being said, none of the modern manifestations rise to the level of credibility.
Fujita is the last person who is given credibility relating to a Koga claim, and even he is questioned by some.
Regards.
Phillip T Hevener