Certainly every group has its own spin on things, and Sifu Sergio has found some interesting info over the years.
Also I saw this a while back...
"Yiu Wing Ken (Yiu Choi’s grandson) explains that, in the old days in Futsan, Yuen Kay San, his grandfather Yiu Choi, and Yip Man were called the "Three Heroes of Wing Chun" and were often mentioned together. Yuen Kay San student, Leung Jan Sing, also provided an ancestral document indicating that Yuen Kay San studied with Fung Siu Ching, who learnt Wimng Chun on the Red Boats, while Yip Man and others studied under Yuen Kay San himself. This record was actually made public in the 1970's but had not been publicly disseminated in the West. Yip Man was not Yuen’s official student, having only learnt a little from him. Yuen Kay San taught Yip Man all the chi sau Yip knew - but this was not all that Yuen Kay San knew. In the order of seniority on the family tree, Yuen Kay San ranked at the first level, that is, he was unarguably the top Wing Chun man during his lifetime, with Yip Man being listed the last. It would be normal, therefore, as he did, for Yip Man to ask Yuen Kay San for instruction.
"Yip Chun also misrepresented the facts of Leung Jan’s biography and reports on his life from several independent sources in claiming to have known Leung Bik whom he portrayed in the movie. He did not know Leung Bik. No Leung Bik ever taught Yip Man. Yip Man was taught by Ng Chung So. Leung Bik was a romantic fiction derived to promote Hong Kong Wing Chun in the early days. Yip obtained superior skills to his class-mates in Futsan by learning from Yuen Kay San. In fact, Yip’s father at one stage, asked his friend,Yuen Kay San’s father to teach Yip Man some Wing Chun."
http://yunhoiwingchun.com.au/article...wing-chun-sifu