Ron Gardenhire and others have commented on the fact that the Twins don't have a candidate to back up Denard Span in center field who is likely to make the roster. In fact, unless Ben Revere made the leap from A ball to the major leagues in a single season, they don't really have any candidates to play center field every day in the entire organization. If Span went down today, its possible Jacque Jones would be out in center field opening day. Jones has not been a center fielder in almost a decade.
What has not been commented on is Span's role in the offense. Not only do the Twins lack a center fielder, but they lack any other players who fit the leadoff role. The next best guy with the combination of on base percentage and speed is proablay Nick Punto. Hudson gets on base, but he is slow and really much better suited to the number two spot. Harris doesn't get on base enough and lacks speed. Casillas? He needs to win a spot on the roster and he isn't an on base guy. The best guy is probably Joe Mauer - just like he is the best number two hitter, number three hitter ...
This lack of organizational depth at AAA in two critical areas is actually alarming. Putting Michael Cuddyer out in center field between Jason Kubel and Delmon Young is going to give the Twins perhaps the worst defensive outfield in baseball. A lineup with Nick Punto at the top looks a lot less formidable, especially if some of the other question marks, like JJ Hardy, come up with negative consequences.
There is a lot riding on Denard Span staying healthy.