I expected AO to pick Cain, just to get into JDS's head, but I think he knows he will most likely be facing JDS upon his return. Cain is probably the most well rounded HW there is on the current roster but JDS has his number. As soon as Cain gets into the range he needs to be in to secure a takedown he's going to eat punches from probably the hardest puncher in the UFC
Unless Cain's boxing has reached new heights since there last fight don't know how you can say its 50/50 or difficult to predict.