49ers Doing Little to Quell Concerns About Retooled, Injured Defense

Over the last three years, the San Francisco 49ers have had one of the most dominant defenses in the NFL. In 2011, defensive coordinator Vic Fangio guided the fourth-best defense in the NFL. In 2012, he coached the No. 3-ranked unit. And in 2013, he instructed the fifth-best defense. 

Yet the past successes of San Francisco’s defense doesn’t necessarily mean it will find guaranteed prosperity in 2014. Why? Because right now, the 49ers are doing little to quell concerns about their retooled, injured defense.