First post here. I've become a fan of Iain's work and I love what he's doing with karate. Since my experience has been with impractical karate, it's actually kind of a breath of fresh air and has made me look at it in a new way.
Just to let you know that John Nawn's e-book 'The Magic of the Left Jab' is FREE for Kindle download for the next 4 days! This book contains a lot of great information for beginner and expert alike -there's a lot of master strategy and street fighting skills to be seen here. A link to 2 free videos with some excellent training drills is also included in the e-book.
In one of Iain's articles about punching power he talks about the development of power. There is a line that states "Another common error is to twist from the center of the body so that one side of the hip travels forward whilst the other side is going backward". The article continues to say" to punch with power at close-range you should pivot from the side of your hip so that the whole body is travelling in the direction of the punch".
I don't think that it's too complicated of a question, but how important do you feel that a clear lineage is to the legitimacy of your karate or any martial art? It seems like everybody and their brother takes the time to back their school/club to a name that everybody will recoginize. But as long as your art is effective outside the dojo and is teachable inside, then should it really matter?