Why is it king Gsp? Why does everyone have to go up or go down to meet him, why can't he test himself?.
Did you not see his last fight? Condit tested him. Why doesn't Jones go up in weight? Why doesn't Ben Henderson do it? Why don't Aldo and Cruz do it?
Not everyone wants to mess with their weight and go up and go down, GSP isn't some slave he's a human being with free will he's signed to fight in the 170 lb division, that is where he is Champion and that is where he defends his belt.
There's plenty of good fights for all the Champions in their own divisions, GSP vs. Hendricks/Marquardt/Diaz are all excellent fights with some interesting factors at play.