GnP was mainly instilled into MMA by Mark Coleman. Prior to him most wrestlers, and even some today would take their opponents down with ease and control them but cud not finish them off. Mark Coleman, Randleman, Kerr were the first wrestlers to GnP. GnP is to finish ur opponent off by just raining down on them.

BJJ would maybe throw punches from Mount to set up submissions..ie chokes and so on but never been to dominant or effective when it comes to GnP. BJJ guys like Nog fight defensively against GnP fighters and wait for the right moment to slap on a submission.

Emelianenko is prob one of the few complete MMA fighters who has mixed GnP and Submissions effectively. Even against Mark Coleman he fought a defensive fight (ie fighting off his back with a closed gaurd) and when Coleman began raining down blows he slapped a submission on. And against Nog he totally dismantled him with GnP and avoided the submission attempts by Nog.

But basically the thread starters Q, GnP is more of a Wrestlers thing..not BJJ. BJJ like i said might throw coupla punches to make the fighter give his arm up or expose the throat to slap a choke on.