Why would they go from 10 nominees for the defenders to 20 for the midfield?
I can understand being stuck between a rock and hard place with someone like Koeman, as he's close to the pinnacle of what a ball-playing CB is, but to put him and also Ramos in in lieu of CB's like Nesta and Kohler makes the list redundant. Even then, putting Cannavaro in over Nesta makes no sense as the criteria shuffles from one place to another to make that so.
There are other obvious omissions already mentioned by others, but it's hard to get past the glaring errors at CB. They should have just expanded the list to 20 across the board for the outfield positions and have 10 of one type to go with 10 of the other. That way, you have the best of both worlds which can be combined as the voters view fit.
I'm betting the final vote will pair two ball-players together: Baresi and Beckenbauer, and that'll be that.