This is a heated debate always.
My 2 brothers practice Zhao Bao Tai Chi, and I practice Chen.
Tai Chi Quan is actually a concept and a theory.
The first classics is about 13 postures, again they are theories first.
Chen Tai Chi is actually called Chen family long fist.
When and how Tai Chi Quan is connected with Chen family fist? It may be only recently.
Ba Gua is also a theory. Dong's palm methods with circle walking are named Ba Gua Zhang, due to the steps in the circle walk representing the 8 hexagrams in 8 directions. However, the palm methods and forearm are more Tai Chi like and also stressing outward Peng. It is called round and extending or Yuan Cheng Jing.
the theories and classics are not complete and so are the practices.
so the work is on the shoulder of all the practitioners and fans.
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what are the theory and practice of your style?