This is a great video, going over the history of modern Karate. It is not what you think it is. Original Okinawan Karate is very different from what is taught as modern Karate. Why is that? This explains why there are those differences. This helps highlight why the really old styles, like Bujinkan, that didn't change with the modern era are as different as they are. Modern sport Karate is actually French in origin!
Shane Sensei is a licensed Shidoshi in the Bujinkan and member of the Shidoshi-Kai. He has trained in the Bujinkan since 1998 and regularly travels to Japan for training.