GB or FB, it is still a ball in play. And, for a GIDP, the ball needs to be hit relatively close to the fielder. It takes some good fortune to get 4 of those like he did against Oakland. Yeah, he's doing his job by inducing GBs, but the luck comes in when they all go right to a fielder with runners on and less than two outs. All of the dominant seasons from sinkerball pitchers in the past decade (Kevin Brown with the Pads/Dodgers, Halladay, Brandon Webb) featured K rates above 6. Derek Lowe's good 2002 featured a K rate of 5.2, but a BB rate of only 1.9. Those last two games for Wang are an example of best case scenario on balls in play. The other shoe will drop.