Using career number the two is not a good idea espeically in Theriot's case. I think he's proven that his 2006 line was an anomaly and that we're much more likely to see the 2007 version in the future. So look at their lines this year: DeRosa: .293/.371/.420/.791 Theriot: .266/.326/.346/.672 Theriot has never shown to have had much power and has a career .066 IsoP in the minors. Even if you take DeRosa's career numbers .278/.341/.408/.749, they're easily better than what Theriot did this year. DeRosa doesn't have a ton of power, but Theriot basically has none (5 HR's in 2048 career AB's in the minors). I would hardly consider DeRosa to be a slightly better batter. Who's to say the last two years for DeRo weren't fluky. And to restate one point DeRosa is 32 and likely to decline while Theriot is 27 and likely to improve or stay the same. Again though, I'm not making the arguement on who should start, I'm making the argument that you can't automatically assume DeRosa should start. Theriot had a great month of July, but was terrible the rest of the season. He's nothing more than a pretty good utility player that was forced into a starting position because there weren't better options at SS. DeRosa is the better player, and it's not even close. You can assume DeRosa should start over Theriot because he's the much better player.