Yang Lu chan changing chen theory
i showed the videoes of the Imperial yang taiji to two of my teachers. the chinese instructor told me that when imperial yang came out into the public eye it shocked the taiji community.
as for my other teacher- we talked about why yang lu chan may have changed his form from chen to whatever- he mentioned that there possibly was some wudang influence. he mentioned that yang lu chan had changed the form 5 times before going to beijing. after beijing he learned of the "classics" from wu yeuh xiang two years later.
he mentioned that there is a good book called "Tai chi ancestors" to read that has good info.
taiji has many animal styles
Its not that hard to know a few styles and know how to seperate and combine the different energies and techniques. If we all did forms the same we would be no better than robots. Dr. Yang has a clear understanding of taiji and his style is very unique.
I didnt learn from Dr Yang but one of his Taiji Students who practices only Dr. Yang's and Yang Zhen Dou's Taiji cirriculum.