Hendricks might land that big punch but mostly likely he is going to get outwrestled and outstruck all night long. We've seen GSP deal with better strikers. We've seen GSP outwrestle wrestlers who are just as good. And Hendricks' cardio and heart are questionable. His cardio has faded in several fights (Kos, Condit) and he was wilting fast in round three against Condit once Condit started picking up momentum. He didn't seem to know what to do once his opponent was winning for any length of time.
This is how I see this fight playing out. He eats a stiff jab when he tries to come in to throw bombs. When he tries to bullrush he'll get taken down and if he manages to get GSP down GSP will just bounce right back to his feet as Hendricks has not shown great ground control. Everybody he has taken down has gotten right back up.
That is not dead which can eternal lie and withs strange aeons even death may die.