Last year, the Arizona Diamondbacks were baseball’s biggest surprise, winning 94 games and the NL West title just a year after finishing 65-97. The team’s turnaround was driven by strong performances across the roster, but among the key factors in their success was the excellent defense delivered by their trio of outfielders. Chris Young (+14.1), Gerardo Parra (+9.6), and Justin Upton (+7.7) all posted UZRs that ranked among the best in the league at their positions, and the Diamondbacks posted the best team outfield UZR (+31.1) in the National League. With the help of their strong gloves, the team was able to post an ERA (3.80) that was 22 points lower than their FIP (4.02), the fifth largest positive differential in the game.
Well, today, the team decided to change course, signing Jason Kubel to a two year, $15 million contract that will see him take over as the team’s left fielder. By acquiring Kubel, the D’Backs have essentially chosen to displace the incumbent Parra, and in looking at the two players, it’s not actually clear that the team is going to get any better.
Kubel’s addition signifies that the Diamondbacks wanted a bit more power from the left side to balance out the right-handedness brought by Upton, Young, Paul Goldschmidt, and Aaron Hill. While Miguel Montero and a potentially healthy Stephen Drew offered some power from the left side, the middle of the team’s batting order still skewed towards RHBs, and Kubel will give the team more thump at the plate than Parra would have. However, if the team thinks they’re getting a monstrous offensive upgrade in making the switch, they’re likely overestimating the difference between them.
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