Shields won't fight at 185 in the UFC. The Gracies in the UFC, other than Royce, in the early days of Semaphore, which other Gracie competed? And in Royce's case, he normally fought from his back using closed guard, so he wasn't throwing downward elbows. And in the case of Royce, he was subbing guys. So I don't get the supposition that BJJ=boring when it was a BJJ fighter that initially popularized the UFC.
Furthermore, everyone trains BJJ in modern MMA. Wrestlers were the first to use elbows from within closed guard, and do so effectively. Mark Coleman, Tito Ortiz popularized GNP.