Jiu-Jitsu is limitless. There are always new techniques that come up and anybody can develop new techniques!
5x world champion Bernardo was recently conducting a seminar in Louisiana and as he always does, he rolled with all the students. One purple belt caught him off guard and put him in a very tight lapel choke which almost made him him tap. Bernardo was so impressed that he asked him to show the technique.
Check it out: