First off, what makes a player unknown? For our argument let's say it's a guy who, though you may have heard of him somehow, hasn't done anything spectacular over the course of his career.
Second, are we saying more than one player is going to win the 2012 PGA Championship? Of course not!
What we are simply saying is there are a handful of players playing in this year's final major who will, at one time or another, grip and raise one of the four greatest trophies in golf (and if it's the Masters, they'll get to wear a pretty nifty green jacket).
These are a group of players who are all relatively low in the World Golf Rankings but have shown signs at some point of eventually breaking through in a major.