Heres my summarized take;
JDS won the fight first legit. It wasn't a "fluke" because knocking people out is what JDS does and it was routine for him.
Cain won the second before he pushed the pace early, riskily, and landed a big shot. From there he sapped JDS' little cardio and put an end to the fight from there on.
Cain is a great strategist and JDS is a great warrior. Not a bad word to be said about either and a 3rd down the line would be insane.