Considering how ridiculously good GSP is at takedowns, I don't think he would even consider standing with Silva. Not to say that he couldn't hold his own, but there is an obvious height disadvantage, and the weight that GSP would have to gain would no doubt make his strikes slower.
I do think that GSP could take Silva on the ground. But it's not really an optimal matchup short of the fact that they are two of the greatest fighters in the UFC right now.
I do think that GSP could take Silva on the ground. But it's not really an optimal matchup short of the fact that they are two of the greatest fighters in the UFC right now.