Let's say you are Royals GM Dayton Moore. A djinn makes the following offer: you can choose any minor league pitcher from any other organization to replace Soria as your closer. You can't pick someone who is already a Royal, but otherwise you can pull any pitcher out of any other system. They are guaranteed to stay healthy.
The caveats: it cannot be anyone who has already pitched in the majors, and you have to use them in the closer role for all of 2012 even if they pitch poorly.
Who do you pick and why? (Addendum: You can't pick Yu Darvish)