You're taking the sentence out of context. By winning the division last year, the Diamondbacks did something that no other team in 105 years of baseball history has EVER done; having more Runs Against than Runs Scored through the regular season AND won the division. Only five teams have ever done the same and made the post-season, but Arizona was the first to win the division with that dubious distinction (712 RS vs. 732 RA). For comparison, the Rockies had 860 RS and 758 RA, Cubs had 752 RS vs. 690 RA, and the Phillies had 892 RS vs. 821 RA.
Found this interesting (to me)
article in the Washington Post, dated Sept. 25, 2007...
WaPo wrote:The Diamondbacks, in fact, may be one of the strangest playoff teams in recent history. Out of 16 NL teams, they rank 15th in batting average (.250), 14th in runs scored (690) and 16th in on-base percentage (.320). They have six rookie position players and one rookie starting pitcher seeing significant playing time. Their leadoff hitter, Young, carries a .298 on-base percentage. There's not a single .300 hitter or 100 RBI man on their roster. They have a bona fide ace in sinkerball specialist Brandon Webb (17-10, 3.02 ERA), but their other starting pitchers have ERAs hovering in the mid-4s.
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As for this Pythagorean thing, it's actually fairly simple: The Diamondbacks are a staggering 32-18, best in the majors, in one-run games, but have 13 losses of seven or more runs.
No doubt the D'Backs are off to a great start (7-2), but certainly not as surpising as the Orioles or the Tigers start. Although the Diamondbacks are hitting the ball well, 17 HRs, 12 of those have come with the bases empty. Overall, they're leading the NL in runs, slugging, and OPS but I would credit their record just as much to their pitching.
It's still a little early to break out the champagne. The Rockies just took the first three games vs. Braves, with today's game being snowed out. Last night, they broke open for 12 runs. Matt Holiday is looking more comfortable and Helton has been solid.