It's not going to happen. JDS isn't Big Nog. He doesn't hold a standing restraining order on head movement. He's not protesting proper footwork or guard. He is the better striker and it will show when Cain is face down on the mat.
And, by the by, Sonnen won exactly one striking exchange in their first fight and none in their second. People always remember his one shot that knocked down Silva and forget how Silva brutally dropped him standing.
That is not dead which can eternal lie and withs strange aeons even death may die.