I have to admit I'm disappointed. All this talk of 'stuff left to do in my division' is just not true. I realize he has always been uber polite, so he doesn't want to say anything like 'There is no one worth fighting in my div', but cut the crap.
If you are ever fighting Silva, now is the time, there is nothing to wait for. There are no challengers that bring anything new. If GSP wants to stay at 170, because thats his natural weight class, fine, just say so, enough hemming and hawing.