I think Yost just played the math. The tying run was at the plate, and so he wanted to bring in the person who he felt would be best against Votto and put down the threat. It isn't like Yost, made this move in the 3rd inning, there were two outs in the 7th. So, he went with the best pitcher he had against lefties in Shouse. I would contend that even while Suppan was hitting his spots, just the fact that he is right handed makes him more hittable than a lefty like Shouse who hides the ball so well. If you played this exact situation out 100 times, Yost's move probably plays out favorable more often than if he had left Suppan in the game. The fact that he made the more mathematically correct move and had it backfire on him in this one instance, does not make it the wrong move. That's baseball, in that sometimes you'll make the best possible move and still get burned. In his career, Suppan has an OPS against of .842 from pitch 76 to 100, up almost 100 points from before that pitch count. Shouse's career OPS against lefties is .598. So basically, just looking at it from a statistical point of view, by bringing in Shouse, the statistics say that the expected OPS against for that at bat went down nearly .250. Even on his best days, I doubt he could match what Shouse does against lefties. All in all, I liked the move to bring in Shouse in that situation. With the tying run at the plate, Yost decided not to mess around and to play his best chip forward. Unfortunately for him it didn't work out and now the second guessers are out in full force. But let's try to recognize that the move was hardly one based merely on managerial stupidity. Let's give Yost a little credit in playing the numbers in a tight game. Even if it didn't work out in this instance.