Well, ignoring the fact that he's clearly still better than Wondolowski, and than Johannsson hasn't been particularly productive in a couple of months, Donovan is a better wing than Davis. He's faster, he's a better defender, and unlike Davis, he has more than one skill. If either Davis or Green starts at the WC, they'll get absolutely worked, and neither brings what Donovan can as a sub. This idea that because Klinsmann has decreed that Donovan is a forward only, that means it makes sense to bring Brad Davis to the World Cup, is indefensible.