Oof, I don't want to turn this into a long digression, but I don't think #9 vs #9 is how to look at it. When the pitcher isn't in the lineup in the AL, it's because there's a DH in there - higher up in the batting order, so everyone shifts down (more or less), so you need to compare a slightly higher-quality bat at every spot in the order, or (more simply) just compare DH to pitcher for the aggregate difference. If anything, taking out the pitchers from the stats might not be enough - you need to assume a better than average bat, not just an average one, taking the pitcher's place in the AL.