A quick google search shows that all the talk about GSP going to Lightweight was at the end of 2011. It seems like it all started with Zahabi saying that he'd like to see GSP drop to 155.
http://www.espn.co.uk/ufc/sport/story/118452.html
In this article which is from around that time GSP says it would be easier to go down than up in weight but he doesn't want to drop to Lightweight. Then he says that he might move up to Middleweight at some stage. I think the way he answered it completely rules out him dropping to 155.
http://www.espn.co.uk/ufc/sport/story/118452.html
In this article which is from around that time GSP says it would be easier to go down than up in weight but he doesn't want to drop to Lightweight. Then he says that he might move up to Middleweight at some stage. I think the way he answered it completely rules out him dropping to 155.

