Last season, the 49ers ranked 11th in net passing yards allowed per game and 14th in net rushing yards allowed per game, but they ranked 28th in points allowed per game. How did this happen? For starters, San Francisco intercepted only two passes all season – a stunning level of ineffectiveness that was part of this team forcing only seven turnovers all year (for reference: the second worst team in the NFL forced 14 turnovers), which led to the 49ers ranking 24th in drive success rate allowed, 18th in yards allowed per drive, and 26th in points allowed per drive. Only . . .