Many critics say the Heat need a big man. How many more superstars do they need? They already have 3!?

I hear people saying that Howard should join the Heat or that they really need a big man. They already got 3 star players now that celebrate themselves and mock their opponents before even winning anything. How many more superstars do they need in order to win a title? They already lost to the Mavs and they only had 1 all-star.