Re: Chapman to bullpen not official.
Originally Posted by jojo
Peripherals are by sabermetric definition the actual things a player could control-i.e. who the player actual was.
You're actually arguing that youre more interested in what the team was when player X was part of the mix. Viewing things through that filter actually clouds estimates of the player's contribution to team wins.
The challenge with the FIP peripherals is that they do ignore the reality that pitchers have some control over BABIP and that some have demonstrated a skill at limiting damage (e.g. Tom Glavine walking more guys but giving up fewer hits and homers with men on base).
I'm with you in that the peripherals give you a more accurate picture than the blunt team results captured by ERA and WHIP. But anybody looking at peripherals to see who a guy was should at least consider the peripherals beyond Ks, BBs and HRs.
Games are won on run differential -- scoring more than your opponent. Runs are runs, scored or prevented they all count the same. Worry about scoring more and allowing fewer, not which positions contribute to which side of the equation or how "consistent" you are at your current level of performance.