Strong Safety Tony Jefferson #23 of the Baltimore Ravens (Photo by Patrick Smith/Getty Images)
The 49ers already have a quality starting safety tandem with Jimmie Ward and Jaquiski Tartt, but Tony Jefferson helps guard against possible injuries.
The San Francisco 49ers are banking on being much healthier than they were last season, when they suffered more player gamedays lost than any other team over the last 10 years.
But one of the lessons head coach Kyle Shanahan and general manager John Lynch learned is just how important it is to have quality depth behind a starting lineup.