‘Depth in the secondary. The Bills kept three outside cornerbacks. Their top backup safety, Damar Hamlin, missed last season and fits better as a role player on special teams. C.J. Gardner-Johnson could not stay healthy during training camp. Cole Bishop missed some time. Maxwell Hairston, the second-year cornerback, had some rough moments after returning from injury. It’s an area of expertise for (new defensive coordinator Jim) Leonhard, but can he use some schematic adjustments to cover up for any issues in personnel if there are injuries?’