Re: AL Pitchers v. NL Pitchers
I wouldn't think RC would be the best stat to use, since it would just reflect the higher numbers of hits, HRs, etc. VORP, on the other hand might already be adjusted for league context. Actually doesn't BP in their team audit (I guess technically their DT stats or something like that) have adjusted stats for leagues? Not positive, but I think that it may be adjusted for league. One interesting thing to look at would be to look at the XR or maybe RC for the ninth hitters in each league for the games. But I don't know how to get this information. I know retrosheet has play by play data and box score data but I've never made an attempt to understand how to get the play by play data, and the box score data, I think, doesn't tell you what each player did in their spot in the lineup, though I could be wrong there.