bumping this.
I noted in the CJ Abrams thread just how much the defense has improved since his call up on 8/15. I use BABIP against / BABIP allowed by pitchers as a way to measure team defense. I like it because it feels like a simple measure, it accounts for range, and it takes away the hit/ error judgment. Prior to Abrams call up, the team had the 4th worst BABIP against in MLB - .305. Since his callup, the team has the 4th best - .253. Small sample, of course, but a huge improvement.
Abrams taking over short is one of the improvements, but you also have Thomas (and occasionally Palacios) more or less full-time in a corner rather than Thomas displacing Robles in CF for his starts. You also have Yadi going down. I love the guy, but he's a DH. Vargas is an upgrade over Franco, too, so that's at least 3+ upgraded positions. Meneses/Voit is a wash with Soto/Bell in terms of D. Just Garcia for Cesar is the only potential downgrade.