LOS ANGELES -- Mark Ellis has 12 defensive runs saved, the most in the major leagues among second basemen not named Dustin Pedroia. He is eighth in something called ultimate zone rating, or UZR.The gap between Ellis' defense and that of any other Dodgers second baseman is yawning, according to all the advanced statistical metrics.And all of this means what, exactly, to Ellis?"My agent tells me about them every once in a while, but honestly, I don't know what half of them mean.