Sakugawa trained him up until his death, and then Sokon was probably on his own for a while. According to oral history, he studied under Sakugawa for 4 years.
Bushi was recruited into the service of the Sho family. At that time, Sho Ko, the king of Okinawa, desired to have him change his last name, as was the custom, and suggested the name Muramatsu (Muramachi), or "village pine." After discussing the matter with some friends and relatives, he decided that Matsumura (Machimura), or "pine village", would be more appropriate. Sokon asked the king to let him change the name to that, and the request was granted. Some say this happened at age 17, which would probably put it around 1813.
Many sources say that Bushi Matsumura trained in China, and it is certainly a strong
tradition. Hohan Soken said that Bushi trained at "Fukien Shaolin" for 26 years and some months. We do not know for sure of his length of time spent in China. We do know that he spent at least 20 years there from the records that were kept for the Okinawan King.
Some prominent students of Bushi Matsumura were Yasutsune Itosu and Chotoku Kyan, although there were many more. Itosu's head student and successor was Chosin Chibana, who formed Kobayashi Shorin-Ryu from Itosu's version of Shuri-Te. Kyan's students formed Shobayashi Shorin-ryu from his personal brand of Shuri-te. Another student of Itosu was Gichin Funakoshi, the founder of Shotokan. Once in a while, Itosu would take him to study under Bushi Matsumura. He was also a student of Azato, a Shorei-Ryu master.