I think they'll want a role-player veteran for the OF, someone who'd be credible starting regularly for a stretch (say, if Buxton and Kepler don't make the team out of spring training) but wouldn't be completely wasted as a part-timer or reserve. Span is too deserving of a full-time starting role to fit there, but there seem to be a lot of veteran free agent outfielders who roughly fit the profile. Gerardo Parra, Matt Joyce, Rajai Davis, Will Venable, Steve Pearce? Alex Rios if the Royals don't bring him back? Nori Aoki if the Giants don't exercise his option? There's also the DFAed Domonic Brown, for a disappointing-ex-top-prospect angle, though maybe that's not the mojo the Twins want around.