GSP and Silva are two completely different fighters. IMO this is where we will see the difference between the calm, methodical, respectful tactician who is also supremely talented, and the brash showman who toyed with his opponents. One will be called boring the other amazing, but the steady tortoise wins this race IMO.
GSP stays where he is. Hendricks is dangerous but not that much stylistically different from Kosheck although he is an improved version. GSP is too methodical on his feet to get caught. It's definitely a possibility though, Hendricks is the biggest challenge to GSP in a while.