Hola.
En referencia a los estilos, linajes, ramas etc... El Bajiquan es un estilo chino, por lo tanto pueden existir cientos de variaciones con diferencias palpables incluso entre los discípulos del mismo maestro...

¿qué opinais Jordi Vilá y los demás kungfuneros?.
Creo que este pequeño texto te puede servir. Esta escrito en inglés, pero os lo pongo tal cual:
General Introduction to Ba Ji Quan
by Kai Yu
Ba ji is an about three-hundred-year-old Gong-Fu style with an impressive and glorious history. Since Yung Zheng times (Yung Zheng, a early emperor of Qing Dynasty), almost every emperor during the Qing Dynasty studied Ba Ji and employed Ba Ji practitioners as his bodyguards or as trainers for his high-level military officers. Emperor Qian Lung said: “For peace and soft style, we have Tai Chi, but for fighting and conquesting, we have Ba Ji.
Ba Ji earns its high reputation in China because of its violent, sudden release of explosive power combined with its simple, yet very efficient techniques. Today this style is still very popular in north China, especially among the young people. Since traditional training is very hard and takes diligent practice, and also because many traditional Chinese Kung Fu masters are often very cautious with whom they share their knowledge, fewer and fewer people can obtain such a high level of competency. Consequently, fewer people have the opportunity to learn the original traditional forms and to obtain a high level of skill. In present times, it is sometime difficult to differentiate between Ba Ji and other styles such as Long Fist when modern players practice these sets. Since the end of the cultural revolution in China, one may be able to find a few people who have made efforts to retrace and keep the original Ba Ji trainings that previously had been delivered generation by generation.
The Origin of Ba Ji Quan
Several different stories exist about the originator of Ba Ji, Zhung Wu. There even exist several versions of the Quan Pu( the secret book of each style that is handed down generation by generation), The original “Quan Pu”(delivered by a grandmaster from “Ba Ji Village” who serve the last emperor, Pu Yi, as his bodyguard and Sifu) recorded a very detailed story. According to this account, Wu was born in the Shangtong Province of China to a rich family. Since childhood, he had a great interest in Kung Fu and tried to learn from every famous great master during that time. After a number of years of studying and training, he achieved a very high level of Kung Fu and had great difficulty finding a better teacher to improve his Kung Fu. So, he announced that if someone could beat him and show something special, he would give his property to that person and would become his student. One day, a couple came in and showed something very special. Wu thought he found the right people and became their student. During a routine visit to the couple while the husband was away, the man’s wife wanted to test Wu’s Kung Fu. During the confrontation, the woman threw Wu to the ground with only one action. The woman felt very sorry for Wu because her husband had taught Wu for twenty years, yet Wu’s Kung Fu was still not good enough. Then, the woman shown Wu some secret things. The next day, when the man returned and saw Wu’s practice, he was surprised. He asked his wife about Wu and was told what happened. The man said that they no longer had anything to teach Wu, for his Kung Fu was now better than theirs. Then, the couple disappeared in silence. Later, Wu went to the famous Shaolin Temple for three years to study Qi Kung from the chief monk. After he left Shaolin Temple, Wu happened to meet another monk, Kui-Yuan Lai, and learned the spear technique from him for another three years. Then, he worked as a transportation-guard. He traveled around the country and met no competitor. Some time later, he went to Peking and showed his Ba Ji and spear . His special Kung Fu surprised everybody including the Emperor and earned his reputation as “Magic Spear Wu”. In his later life, he stayed in Meng Chun with his daughter, Wu Rong, and his first student, Wu Yung who came from Meng Chun, and taught Ba Ji there. Today people call Meng Chun the Ba Ji Village.
Ba Ji Training
In the original Ba Ji system, there were not as many
routines or forms as found today. Many new Ba Ji
students, who had previously become accomplished in
other styles, brought many additional routines to
present day Ba Ji. The original forms (excluding the
weapons forms): Jin Gang Ba Shi (gold-steal eight
forms), Ba Ji Xiao Jia (Ba Ji Short Form), Ba Ji(Ba Ji
Long form), Ba Ji Two Person Routine(application),
and Liou Da Kai(six big open). Ba Ji training includes
spirit training, external body build-up, internal Qi
Gung training and technique training. The spirit training develops eight different kinds of spirits. The external movement and technique training teaches to move like eight different kind of animals and builds eight different kinds of skills. And the Qi Gung training combined with spirit training enables people to release the special explosive Ba Ji power.
The training procedure of Ba Ji system includes three stages. The first stage includes:
Zhang Zhuang(stance) or Di Pen Bu;
Jin Gang Ba Shi and;
Ba Ji Xiao Jia.
The stance, which helps to build leg strength, strengthen the spirit, and sink the Qi, is the first and the most difficult training for the Ba Ji students. Jin Gang Ba Shi is used to develop Ba Ji power. Ba Ji Xiao Jia is for the training of body movement, basic techniques and body built-up. The first stage usually takes one to three years. After finishing the first stage, it can be said that the Ba Ji student has a small completion.
The second stage includes: Ba Ji, Ba Ji Two People Routine, and Liou Da Ka. All of them are for the training of Body’s internal and external movement and technique. This stage takes three more years. After this stage, one’s external strength, internal feeling, and Qi Gung power should be great.
The final stage is dedicated to the internal training.
It includes: Xu Xi Gung ( Qi Gung, number counting style
to enhance the inside-body), Nei Dong Gung (Qi Gung,
internal movement style, for feeling and
health) and Kou Qi Gung (Qi Gung, mouth gas style for power). It is believed that all these Qi Gung styles originated from Shaolin Temple. No person can claim that he has completed the highest level. But there is a common saying: “After ten years of serious training, people can claim to have a big completion.”
Ba Ji Principles and Theory
Ba Ji theory is quite simple. Imagine a situation in which there are four people holding your arms and your legs to the ground with a fifth person threatening to cut your arm off. You are scared. You forget everything and try to escape from the four people. At this moment, even though you are a normal person, you may somehow be able to show a great power and successfully escape from the four people’s control. But later, when asked to show this power again, you cannot do so. Why? In the Ba Ji theory, it is believed that before you are born, you have a natural power attached to your body, but after birth, you are taught how to walk, how to use your hand, and how to enhance your muscle. As a result, you develop the learned muscular power and forget the natural one. Later in daily life, when you need to use your power, you naturally do it by using the learned way. But sometimes when you have an empty mind or a crazy mind, you forget the learned way and the natural power may readily surface. This power is one of the major treasures of Ba Ji. From this point of view, the first stage of training in Ba Ji system transforms the learned power to the natural one thus the first stage is most important in the Ba Ji training system.