If by 'something' you mean Ch'an Buddhism, well, that has been attributed to this legendary individual called Bodhidharma. If you mean martial IP/IS/Aiki, I think that is unfounded speculation.
I meant martial arts of which IP/IS "was" a part. Just reading it from the book. Just wondering if you have any better speculation? At this point, it doesn't matter, people are beginning to understand how and why it was a part of martial arts. Or are you speculating that IP was never a part of the martial arts?