Problem with Wing Chun history in general is that there isn't any scientific research on the subject . What we have are stories from pulp fiction novels which was very popular in 1920s ans 1930s and old people stories largely influenced with same pulp fiction stories . There aren't any physical evidence , written documents , nothing to support any of the Wing Chun origin stories . Some people did some research , fine , but question remains , are thous people qualified to do historical research? Again , what we have are old people's stories , nothing else . There is no scientific approach in their research, no systematic data collecting , no validation of the collected material of any kind . There are some "documents " , but these "documents" did't pass any validation test , without that how can we know these documents are real and how we can we prove their genuinity . So , question is , what do we really know about wing chun history ?