Because even Messi played bad game, he was still the most dangerous man on the pitch in both games. Yes even in el classico. I saw him made a run and the whole defense move to the left giving xavi whole space for himself. He is the only person who is capable of opening our defense, he ran at our defense make our defense have to scramble, collapsing and he attract not 1 not 2 but 6 players when he made his run.