49ers’ fill-ins can’t come up blank
This is my Saturday column. Before we get to the 49ers’ upcoming preseason game, here’s a brief history lesson. In 2010, the 49ers’ defense was ordinary. It ranked 13th in yards allowed and 16th in points given up. Four current starters were key contributors on that 2010 defense – Patrick Willis, Justin Smith, Ahmad Brooks and Ray McDonald. After the 2010 season, the 49ers drafted Aldon Smith and signed Carlos…