Actually I think the dumbest thing GSP could try and do is prolonged grappling exchanges with Penn on the bottom. He needs to work like he did against Serra in their second fight, mixing up the guard/half-guard passes with rising up and landing shots from on top. The longer he's on the ground against BJ the better the chances of Penn trapping an arm for a triangle or omoplata and using that to try a submission of sweep GSP.