SAN FRANCISCO >> There are limits to statistics in baseball. Batting averages, ERAs and won-loss records are not compiled in a vacuum. The statistics are compiled in sequences and situations that vary far more than a gray sheet of numbers would ever let on.So when the Dodgers boast about their depth, it's convenient to point to the gaudy stats next to names like Alex Guerrero, Scott Van Slyke, Justin Turner and Andre Ethier, none of whom started on Opening Day.