They only have one lefty reliever, Paterson and so wanted to save him for Fielder. Loading the bases via walk is always bad idea, since it forces the pitcher to throw strikes and hitters have a huge advantage. Kotsay isn't that good of a hitter. Not wanting Ziegler to face him makes sense, not brining in another pitcher there doesn't. Also why you didn't have the wheel play on with Lucroy and the obvious squeeze, or at least order a pitch out (with Yuni on 1B even) I don't get.