GSP vs Jake Shields may happen?

GSP and Jake really haven't fought many of the same fighters, and they fight in different organizations. I don't see this fight happening unless Strikeforce was to go under. But I'd give the nod to GSP because I believe he is top 3 pound-for-pound in the world. No disrespect to Jake though, he is a great fighter and hasn't lost in 5 years!