I would have preferred having Cole, but I can understand the value in tangibly putting your faith in your players and going for all the marbles. I would have preferred they didn't considering the fact that it required winning a game against Cueto, who they've historically struggled against, and the Diamondbacks beating a Wainwright... But I can stomach the move - especially since Volquez has pitched relatively well as of late.
Having said that, Volquez isn't a dominant pitcher. He doesn't make batters miss. He depends on sound mechanics. Nevermind the fact that he was horse shit this time last year. He should have had a short leash. He's not the type of pitcher you let pitch himself out of a jam in a do or die game, especially if the innings preceding that consisted of hitable/hard hit balls. And in a game where there's no next game if you lose, you don't scrape the bottom of your bullpen to preserve what little chance you have left of winning.
Hurdle managed this game like it was the regular season.
