GSP would never fight at LW I highly doubt he can drop that much safely. I think the GSP Silva fight happens but at 177. Silva is already prepping for that weight and it was his idea to bait GSP with it. He has said in interviews he will go down if needed for that fight but he wants it for the belt and GSP won't go for it. The outcome would be very intriquing and I as an MMA fan hope they figure it out , if not for a great fight just so people can stop talkin about it already.