So, Ip Man then obviously didn't use this "logical step-by-step progression" is what you seem to be saying.
He didn't bother with those who were not worth the effort.
So, WSL is the ONLY student of Ip Man that learned the "logical" version of his system is what you seem to be saying.
I have not experienced all of the various approaches to YM VT, and I don;t think LFJ would claim to have seen them all either,
So WSL was able to impart the system to multiple students, but Ip Man was only able to impart it to one is what you seem to be saying.
LFJ is saying probably few vs many, not none vs many. It is only possible to work with the info you have.
So how can you possibly know that the system method has not changed if Ip Man only managed to teach it to WSL? You have nothing to compare WSLVT to that proves it is what Ip Man taught!
The method itself contains evidence. WSL provided evidence.
You know of no other student of Ip Man that taught the same thing as WSL.
Correct
So at this point there is no way to know for sure that WSL had not changed anything in what he learned from Ip Man.
Incorrect