It seems to me, from Dusty's quotes, that experience was the most important factor in this decision. Considering how different the playoffs are from the regular season, and how close the pitchers are in talent, i can't argue against it. It's not like Josh Fogg was chosen over Wood.
And while Wood has pitched well enough to start in the playoffs, he has around 100 innings pitched in the majors. It's hard to say anyone would know his true ability yet.