Best Pitcher

Considering only the given numbers, I think Chris Carpenter was the best pitcher in 2009. He has a low BB/IP, a high K/IP, and a low ERA. He also has the lowest HR/IP, showing that his low ERA is not necessarily a result of his team's defense, because the number of HRs hit can only be controlled by the pitcher, not the fielders. Though he may not be the best in every category, he is consistently in the top 5, while other pitchers fluctuate between the best and the worst of various categories.