The San Francisco 49ers’ new defensive coordinator Robert Saleh plans to install a Pete Carroll-style defense similar to those played by Saleh’s previous teams, the Seattle Seahawks and Jacksonville Jaguars.
Saleh’s defense will likely be a 4-3 under/over hybrid on base downs, in front of a single-high secondary, playing a mix of Cover-3 Press and Cover-1. We recently discussed how the 49ers’ personnel will fit into their new 4-3 scheme.
Similar to the Seahawks and Jaguars, who play base defense at the highest rate in the league, the 49ers will likely be in base defense in many early down situations, even against three-wide receiver sets.