JWA was the only promotion in Japan, and was ran by Rikidozan. When he died his two prized students, Inoki and Baba, couldn't decided on a style as one liked Strong Style and the other liked what became Kings Road style. So JWA went under and New Japan Pro-Wrestling and All Japan Pro-Wrestling were formed and both had their styles. Then later Misawa after getting tired of Baba's wife shit after Baba's death said fuck this place I am out, and created NOAH, named after the bible story. But, New Japan had the same thing when several of its people, including Akira Maeda, Yoshiaki Fujiwara, and Rusher Kimura to name a few, wanted a different style and went one to create Shoot Style, which became the base for MMA.