Stats can't tell the whole story, it is just how things are. BABIP is luck based but it is impossible to account for how much of it is luck and how much is something else. Getting behind in the count lowers your BABIP as a hitter, hitting weak groundballs and popups lower it, being slow lowers it. You can somewhat normalize it to what they have done the past 3 years but even that is somewhat flawed. OPS gives you a decent picture of how good a guy was offensively, it isn't perfect by any means. ERA doesn't even reach the decent picture because so much of what happens is out of a pitchers control.