"Beane and the A's were mostly focusing on offense, because that's were they could find value."
This is not true. One, the big three of Zito, Hudson, and Mulder is one of the best front ends to a pitching staff in baseball history. Moreover, Isringhausen, Bradford, Mecir, and others on that staff were all players undervalued by the traditional ways of evaluating players. They had a team ERA+ 122. That is not a team which is "mostly focussing on offense."
I worded my post poorly. I meant to imply that their big value finds in free agency came through offense. They were able to adequately replace Damon and Giambi (Jason) with much cheaper counterparts. It would have been much more difficult to find cheap replacements for the big three.
Zito, Hudson, and Mulder were all draft picks. I think Moneyball did discuss the A's strategy to draft college pitchers instead of high school, as Beane found high school pitchers to be over-valued.
This is not true. One, the big three of Zito, Hudson, and Mulder is one of the best front ends to a pitching staff in baseball history. Moreover, Isringhausen, Bradford, Mecir, and others on that staff were all players undervalued by the traditional ways of evaluating players. They had a team ERA+ 122. That is not a team which is "mostly focussing on offense."