Ive never seen Ronald Duncan's videos either, nor do I care about his skill levels. Im tired of people making up lies to sell their arts to the uninformed mass. Regardless of RVD's videos, AT least he has trained with Hatsumi. I don't know how skilled he is. From what ive seen on Combat Ninjutsu and from snippets of his black belt home study course (im not a home study student don't worry lol), it doesn't look like the right fit for me Honesty though, some of Hatsumi's newer videos make me wonder about the effectiveness of some of it, but I haven't been on the receiving end so I will not judge I do like the older Bujinkan videos though. Good stuff!