I can't believe defense is extremely important and still doubt that this writer and the stats are way overstating their case? A run a game difference is pretty high, especially considering it takes no account of any of the other factors that differentiate teams. Like talent, ballpark, divisional strength, etc. If these numbers are to be as trusted as the author seems to believe, they eat a pretty unbelievable chunk out of any differential that exists. Once again, the problem isn't the stats or the argument he's making - it's the use and presentation of them. This continues to be an alarming trend in baseball metrics. You don't get to fill an entire paragraph of exclamation point laden "holy craps!" about what these numbers say about defense and then hide behind "people are taking these numbers too literally". That just doesn't work.