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Oakland has a lot of quantity in prospects, an absolutely dominant bullpen, and their SPs are loaded with upside. They basically ran a bunch of rookies out there and still managed to be a true talent .500+ team.
Anderson is an ace starting in '10. Don't ask me how a command lefty with a high 80s fastballs turns into one of the hardest throwing leftys in the majors in 2 years, but it is what it is. Anderson's fastball has been rising every month this season.
The offense is what still isn't there. They're were better than the Mariners offensively, but will still need to add a lot of pieces in the offseason (they can with that system).