Hey Josh, not sure if it slipped your mind or if you just aren't aware but Pat Curran knocked Straus out in the 1st match. Straus won the 2nd in a close decision. This would be the 3rd battle. The series being 1-1 is the reason for the rematch.
Pat Curran won 2 different Bellator tourney and defended his title a couple times. He is the perfect example of the new Bellator rule about past Champions being a great idea IMO.