Woody can bring a lot to a team besides game wins. While those are important, if your team has a young pitching staff (and I'm not terribly familiar with SD, so I don't know what your rotation is looking like), Williams can be very valuable in a mentor role. His record this past season is misleading as well, as he lost a lot of 1 or 2 run games, which a pitcher for the Cards should not be losing. If SD's pitching coach is smart, and you guys can give him 3-4 runs a game, you got a good deal. I certainly wish him the best.
A two-one series advantage is just that: an advantage. No way Woody should go; Clement can close it out at home, and if you fail, you still have Wood on four days rest to go at Turner. The Cubs don't have to win Saturday. The Braves do.