Hi;
Your questions are too broad to answer.
In Tai Chi, 8 trigrams represent 8 directions and 8 Jing methods directed at the 8 directions.
The 4 fronts are north, south, east and west. There are Peng Lu Ji An. Peng to your front. Lu to your left or right rear. Ji or An to your left or right.
The 4 corners between 4 fronts. There are Cai Lie Zhou Kao.
There are 5 steps in Tai Chi. They are equivalent to Wu Xing or metal, wood, water, fire, and earth.
The center or Zhong Ding is the earth. Jin Tui Gu Pang or advance, retreat, look to the left and gaze to the right.
So Ba Gua and Wu Xing are used commonly in CMA as denominators for directions and methods etc.
They are not to confuse or mystify. They are used to categorize concepts in orders of 8 or five. They also represent relationships of assimilation, antagonism, helping or retarding etc.
If the opponent Peng, you then Lu.
If the opponent Lu, you then Ji.
If the opponent Ji, you then An.
The 8 trigrams and 5 elements are called Tai Chi 13 Shi.
Or Peng Lu Ji An Cai Lie Zhou Kao Jin Tui Gu Pang Ding are called Tai Chi 13 postures.
And yes, all Tai Chi moves contain some of the 13 Shi.
As you may see, the use of Ba Gua and Wu Xing is to help us study and practice.
They are not to confuse or mystify.
Although Qi would be a different story.
