All styles, like David(s) and others pointed out, are evolving constantly, but at a pace measured in generations, perhaps only barely visible in our own lifetimes. Even a seminal figure like Bruce Lee took two generations to establish his style. And the rule is, the more generations removed from the 'seminal figure' the weaker the Fu.
As with all study, once you have completed the regular training to the standard of your instructor, you begin to hone your skills further, and perhaps some might find a new bit to add. That being said, perhaps consistency is more relevant than purity. Purity to me indicates an un changed, un evolving constant, which may be good for academic purposes as a snapshot, but its not a living breathing thing.
Here's the question in my mind, if you have two options, or 3 or more, in a situation, which do you choose? If you are a striker who has a little x-training to understand grappling, do you grapple or strike? Can you afford the time to think about it?
It takes work to learn to apply a style of fighting, boxing, wrestling or Pak Mei and it becomes an issue of depth vs breadth with how many different things you learn.
And it goes without saying that if you find holes, you fill them with whatever works for you. Its the duplication that worries me.
Last edited by Yum Cha; 07-02-2013 at 08:01 PM.
Guangzhou Pak Mei Kung Fu School, Sydney Australia,
Sifu Leung, Yuk Seng
Established 1989, Glebe Australia