I love the Diaz brothers. Big fan. But when was the last time Nick subbed anyone (off of his back) with even remotely decent top control? It would be a great fight in that Nick would constantly look to land from bottom, like Condit, but his chances of submitting GSP aren't what people sometimes make them out to be. Good as he is, Nick's ground game can be nullified by good top control. Factor in someone like GSP, who has great top control, and yeah... long night for Diaz.