Cain is the fastest most well rounded opponent he has ever faced. (Gonzaga is an honorable mention, Mir seems a bit Slow in their last fight) He is also the best wrestler. Carwin is the closest in that depart and even then, Carwin resorted to standing and trading with him but his cardio and speed just was not there. Don't get me wrong, Junior is a very dangerous and talented guy and has the tools to knock out Cain again but if Cain is mentally prepared it will be a War and the advantage goes to Cain via speed, cardio, and versatility.