With how much mass GSP
With how much mass GSP has put on for both his acting roles and the Bisping fight it will be a struggle for him to make WW again. GSP making it down to LW is not possible short of chopping off a limb.Moving down a division isn't an advantage if you face someone that is big for that division. You will both weigh the same. If GSP moves down to LW, he's wont be bigger or stronger than Khabib or Lee for example.
When you lose weight, you also lose size and strength. It's mind boggling isn't it?