Kilik said:
This just not true. There's no evidence of this. THere's no "neijiaquan" missing link unifying the 3 systems in the past, and xingyi and bagua certainly do not come from Chen.
One more time, since you are nothing if not persistent in your ignorance...'
developed from'.
Those other arts today have developed part of their totality by incoporating things from Taijiquan...including Chen concepts that came to Taiji and then the others from nowhere else.
You mentioned Sun...but you don't have a clue that he is one of those who developed a HsingYi method by synthesizing things from Taji, do you?
Sun Lu Tang - A Brief Chronology of His Life
1861 Born. His given name was Sun Fu Quan.
1861-1871
.
Worked as a servant for a rich man.
Learned Shaolin Hung Boxing from Master Wu.
Lived with and worked for his uncle, and studied calligraphy.
Started learning Hsing I Quan martial arts from Li Kui-Yuan.
Sun Lu-Tang became a formal discipline of Li Kui-Yuan
1882 Started learning Hsing I Quan from Guo Yun Shen.
1891 Started learning Dragon style Pa Kua Chuan from the famous
Pa Kua master Cheng T'ing Hua.(1848-1900)
1894 Started using the name 'Sun Lu Tang' given to him by Cheng T'ing Hua
1894 Studied Yi Jing theory and Emei Qigong in mountains of Sichuan
1895 Studied Taoism in the Wu Dang Mountains
1896 Established the Pu Yang Boxing Association in Bao Ding
1911 Learned Wu Yu-xiang style of
Taijiquan from Hao Wei Chen (1849-1920)
Sun was 50 years of age when he learned Wu Yu-xiang style Taiji.
1912 Sun began creating Sun style Taijiquan
http://www.egreenway.com/taichichuan/sun22.htm
Sun Lu Tang's Style of
Xing Yi Quan
"...many consider Sun Lu Tang to be the highest level master of Hopei style Hsing I Ch'uan that has ever lived..."
Xing Yi Quan Xue: The Study of Form-Mind Boxing. By Sun Lu Tang.
This book was first published in 1915.
http://www.egreenway.com/taichichuan/hsingyi.htm
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So unless you have a time machine, and can only study ancient unmodified arts prior to their development into integrated systems, the statement that Hsingyi today has developed from Taiji, stands.
Now if you have evidence that the things which are found in the original (Chen) Taijiquan, but not in earlier versions of Hsingyi did NOT get there from Taiji, in spite of the historical linkages, feel free to post it.