As we head into Week 1 and put the offseason in the rearview mirror, we can turn the page from hearing about how much talent the San Francisco 49ers lost this season. Ultimately, the players who left in free agency were either expendable, replaced by rookies, or had players waiting in the wings to replace them.

One starter the 49ers must replace, Aaron Banks, suffered a back injury that hampered him for much of this past training camp with the Green Bay Packers. While Banks is no longer on the injury report, when is the last time you met somebody who used to have a bad back? Those injuries linger and can pop up again at any moment.

San Francisco replaced Banks with a much cheaper version in Ben Bartch. He’s no stranger to the injury list, either. However, Bartch’s play last year made Ban

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