TWhat I AM saying is that if you take one fundamental thing....the interpretation of Tan Sau.....in which WSLVT differs from every other branch of Ip Man Wing Chun....then the common sense conclusion using Occam's Razor is that this particular interpretation of Tan Sau originated with WSL himself, given that all the other branches of Ip Man Wing Chun agree on their fundamental interpretation of Tan Sau.
But they don't agree on their interpretation of Tan sau. All they agree upon is that it is some kind of bridging or chi sau or blocking technique. Leung Ting disagrees with Duncan leung. But all of these interpretations are ones that could be extrapolated from seeing it being trained. They are basic, easy to arrive at conclusions.
It is far simpler to assume that WSL came up with his nuanced understanding of something like Tan by learning it correctly from his teacher, rather than assuming he came up with such awesome detail and conceptual clarity all by himself. What WSL VT communicates is obviously the work of generations, not of one man.