Quote paraphrased from the late great Brazilian Jiu-Jitsu practitioner and trainer, Carlson Gracie. He said,"Punch a jiu-jitsu black belt in the face once and he becomes a brown belt, punch him in the face twice and he becomes a purple belt." In my opinion what Carlson was trying to say is jiu-jitsu practitioners and grapplers of others diciplines in grappling need to be more rounded in other combat disciplines such as boxing, muay thai kick boxing and other striking disciplines. So after your practicises in grappling are over, cross train with the strikers and learn a thing or two about a jab, a left hook and a low round kick. It will make us better combat grapplers so we all should thank Carlson Gracie.