Didn't Beane actually decide at some point 6-8 years ago that "great defense" was the new OBP, ie. an asset undervalued by the rest of the marketplace? Hence his love affair with guys like Mark Ellis, Eric Chavez, Coco Crisp, Rajai Davis, etc.... I know as well that the Red Sox and other teams have put a lot of effort into developing their spiffy new-age "defensive metrics" and spending on players who they see as amazing defenders- Adrian Beltre, Mike Cameron, Carl Crawford, etc.
I know a lot of the wacky new defensive stats out there are kinda pretentious ("UZR-whatever"...), and a lot of them seem like they may be going around their ass to get to their elbow- yes, we know Carl Crawford is a great outfielder, just watch him!- but my basic point is, I don't think we should dismissively assume that, because Luhnow is a "Moneyball Guy", he therefore doesn't care about defense. After all, it's not as though Jack Cust has been anointed the Opening Day RF'er.