Yes, I am aware of Hendrik's theory -- and as I have said, I think it is interesting. But, it is not FACT as he keeps portraying it.
True.WCK did not spring forth from a vacuum!
Above, you wrote that "Those elements were then assembled, combined, and used in a new way to become WCK." My view is that this didn't occur intentionally, as some planned invention of some new art. I don't think arts ever develop that way -- or can. I think it was unstructured, unplanned, and organic, growing out of their fighting. And they may have taken various aspects from various curriculum to teach their new method.Its developers were all experienced martial artists. Who those original developers were is not clear. The theory is simply looking at what the likely foundational methods may have been.