Almost more important than the stats and ratios is IP/g numbers, and having enough innings and/or enough pitchers. One of the reasons the deadballers are "cookies" is that they are easy to manage, easier than modern era pitchers with less innings. Success begins with having your starting pitcher rested, along with a rested relief corps. for the game. Some very useful pitchers do not have particularly good ratios, but we are successful with them because they are easier to keep fresh, and they leave us more money for offense. And, ballpark selection is crucial with some pitchers. Pitchers who would get murdered in Coors might be Cy Young candidates in Petco.