Nice find! I totally agree with GSP. There is alot he has to consider when jumping to 185. I think he knows he's already big for 170 and if he makes that jump to fight Silva, his body may not let him return to 170. It's not just as simple as him putting on 15 lbs for a fight, staying lean, and maintaining good cardio.
I hope this fight happens and would love to see it, but really sounds like GSP does not want to make the move.
And I don't see Anderson agreeing to a catch weight under 185.