re: Would Messi have to win a WC to be considered the Greatest of All-Time?

I don't necessarily think so. The World Cup is damn hard to win and if you're lucky, you'll play in four in your lifetime. He also got the unlucky task of playing during this Spanish Armada. He is, I think, going to have to do something more than dominate La Liga. He simply hasn't shown up on the international scale at all