One must take note that karate's grappling waza is all together different than jujitsu. having delved deeply into wushu/quan fa, I've found the commonality between karate and Chinese grappling are much closer.... than say jujitsu and karate. Imo this is the reason is why much of bunkai out there in the public eye doesn't make sense. Everyone knows karate's history is based on Okinawan and Southern quan fa..... so why do people look to judo, jujitsu etc... (main land Japanese arts) for there answers on grappling bunkai.??? Many of the more obscured movements in kata become clear just by poking around in shuai jiao ..,. yes jujitsu is a great art.... but from what ive found it doesn't answer many of the grappling bunkai question that I've had.... Chinese arts on the other hand have.... (mainly. shuai jiao and change quantum)