Travis Metcalf may not be a superstar, but he's a nice pick up from the Rangers. A quick look at his minor league stats shows that Metcalf struggles in his first year at a new level before adjusting. This will be his second full year at AAA.
These are his numbers from two short stints in the majors:
2007 - 255/307/435 in 181 PAs
2008 - 232/279/589 in 61 PAs
Here are the numbers I think matter:
2007 - .308 batting average on balls in play
2008 - .179 batting average on balls in play
That is some bad, bad luck in 2008. Small sample size makes the numbers worse than they would be over a full season, but it seems to me that a little regression to the mean would give the Royals a back up third baseman who can bang a few homers if given the opportunity.