I think Andy could make 170, but it would ruin his cardio and strength. He wouldn't be the Anderson we've come to expect amazing things from each time he steps in the cage.
I have no interest in seing this fight at 170 and very little interest in seing it at catchweight. If it happens, it's because GSP decides to move up to 185 permanently and that doesn't seem very likely ATM.
So - thanks but no thanks. Would much rather see Andy have a few more fights at LHW than this.