Goalkeepers draw both praise and ire in abundance. They stand isolated in a position of power and pressure. A solitary position such as this allows critics to more easily pick out flaws or possibly greatness. The best keepers and the worst are spotted readily. However, what separates one quality keeper from another? How do we know which goalkeeper is stronger when there is more than one with extreme talent? Or more pointedly, for Mexico at least, how do you separate out four great goalkeepers from each other?