Rousey fought judo at 155. She started MMA at 145. She ducked Cyborg to fight for the Strikeforce 135 title and continued that into UFC. Holm is the first person she's fought in years that was as big as Rousey naturally. Holm boxed at 139-145 for much of her career. She's also a highly skilled boxer/kickboxer with actual footwork. Rousey hadn't faced someone her own size with actual professional fighting skill outside of MMA. She's a bully who didn't have a plan B. She won't win the rematch either.
