I know that silva would be the favorite over gsp and i am fine with that considering the size advantage. However as long as i have visions of lutter essentially crawling at silva and taking him down and then eventually gaining full mount i will favor gsp.
He his takedowns are so explosive and his timing impeccable that he would be able to take silva down. He wouldnt do much damage but he has such a strong top game that he would be able to wear on silva. He has incredible cardio as well so i dont see him tiring as the fight wears on.