Rockhold went into the fight with Romero with a sound gameplan. Keep the range with the 1-2, throw the inside leg kick, circle and get out when Romero explodes. Wear him out progressively, and increase pressure accordingly. The problem was that this strategy requires someone with very good lateral and head movement, someone quick and mobile. Like Whitaker. Rockhold is long and lanky, has good range, but his head movement and footwork is not particularly brisk. He is prone to getting hit more than usual. Romero started to realize he could plow through the 1-2 combos, and started to connect more in round 2. Rockhold stayed in gameplan, hoping Romero would soon blow his wad before he could catch him. But Rockhold just wasn't quick enough. It was the right plan against Romero, just not the best for Rockhold to execute. He didn't make a mistake, he just came up short. I think Rockhold is going through a similar problem to Weidman's: he forgot that he is a pressure first fighter, who dominates in top control and pushing the pace. He is not a reactive fighter, like Anderson, who can play defensively, since he doesn't take pressure well, and is not the most graceful in movement or reflexes. He needs to take a more aggressive approach, and get himself in the positions he needs to be.