While I agree with your point broadly, I'm still not convinced that Vitters is just a guess hitter. The numbers say that, but the scouts are pretty much in agreement that he has quite the good batting eye, but that his problem is a lack of patience. He can hit lots of pitches, and tended to take the first one he could hit regardless of whether that "hit" was a weak infield grounder or a double off the wall. So far as I can tell, that sort of a problem would be almost indistinguishable from a true swing and hope for the best type hitter on the stat sheet. His (admittedly limited in sample size and) generally abbreviated 2013 campaign lends some weak evidence that the scouts might have this one right.
We'll find out this season, if Vitters can stay healthy.
But I also agree that, if that is the case, Vitters is a fairly unusual exception and not a phenomenon we can expect to see often.