I don't know the exact origins of the various movements of the forms Dr. Shen taught, he was a researcher and innovator as well as a direct descendent from various lineages. His autobiography can be found here: http://www.shenhongxun.com/biography-01.htm

Spontaneous movement, however, is movement without form, or rather what form there is is dictated by the blockages in the mind and body, and these are manifested in a state of pure (as much as that is possible) observation on the part of the practitioner.

I think your comment is a bit pretentious actually, but I don't mind, I'm sure you're very capable and well versed as well as being a natural.

Thank you.