Indeed, defense is more crucial in Brazilian Jiu Jitsu than the execution of the BJJ skills. If you are a pro at defense, you can compete and win BJJ tournaments, getting the higher-ranked BJJ belts.
So, if your goal is to transition from being a good to a pro BJJ player, then mastering submissions is a must.However, learning and excelling in every submission technique available for Brazilian Jiu Jitsu is not feasible. Instead, you need to concentrate on honing those techniques that almost assure victory when you lock them. Here are the three submissions that every BJJ black belt must learn to ensure victory against pro players. Watch this video in which John Danaher, Bernardo Faria and Craig Jones have demonstrated the submission techniques.