I've maintained the position that Anderson would destroy GSP for years now and I'm still on that train. Even if GSP bulks up he will still be a bulked up WW fighting a LHW, not to mention that LHW is arguably the greatest fighter of all time, it's not like GSP is going to be fighting a guy who's only ability is his size. The size just gives an amazing fighter an obvious advantage before the bell even rings, as if fighting Anderson isn't hard enough already when the sizes are equal. What GSP does at WW is WW, personally I don't even think GSP would beat Sonnen in a 3 rounder. GSP vs Anderson is a name vs name fight, in reality it's a mismatch.
I would be interested to see GSP fight at MW if Anderson moves up which he said he doesn't want to or if Anderson retires. It will also make the WW division alot more intriguing if GSP moved up. Assuming he beats Shields of course.