Five starters. Less than three years.
Through injury, free agency, disciplinary issues and retirements, that's all that's left from the opening lineup the 49ers trotted out to begin Super Bowl XLVII against the Baltimore Ravens (who are encountering issues of their own).
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That doesn't even account for the coaching staff. Jim Harbaugh's shelf life ran out with management and many players. Rather than bring in a fresh face like Adam Gase or elevate their impactful defensive coordinator Vic Fangio (whom Harbaugh brought with him from Stanford), they went with the solid, dutiful, yet non-charismatic eight-year defensive line coach, Jim Tomsula, who seemed in over his head from the opening press conference.