Answer:
they are the best team because they have really good players eg: messi, puyol and villa. also there coach is a really good coach. If you watch some of there plays on you-tube you might see how they do a lot of teamwork and passing of the ball around and if they have to they can run it down to the net. also they might have a lot of money and they can afford really good players to make their team even better or they trade their players.