The last time Rios was actually down in a fight was in 2006. He's got a granite chin and kept his guard up all night and never really opened up to let his hands go He was basically Clottey except he threw punches while clinching
Not disappointed, what I expected. He has been on the decline the last few years now and a mere shell of his former self. Still a threat to the best, but he isn't going to win. I would advise retirement and focus on politics.
He fought a little on the cautious side. That being said, would you blame him? This is his first fight after getting KTFO.