The San Francisco 49ers\u2019 new defensive coordinator Robert Saleh plans to install a Pete Carroll-style defense<\/strong><\/a> similar to those played by Saleh\u2019s previous teams, the Seattle Seahawks and Jacksonville Jaguars.<\/p>\n Saleh\u2019s defense will likely be a 4-3 under\/over hybrid<\/strong><\/a> on base downs, in front of a single-high secondary, playing a mix of Cover-3 Press and Cover-1. We recently discussed<\/strong><\/a> how the 49ers\u2019 personnel will fit into their new 4-3 scheme.<\/p>\n 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. Still, the NFL is a passing league, and sub packages will be an equally important part of the 49ers\u2019 2017 overall defense.<\/p>\n Let\u2019s take a look at the 2016 Jaguars\u2019 nickel defense \u2014 specifically coverages other than Cover-3 Press \u2014 and discuss how the 2017 49ers roster will fit into the defense scheme.<\/p>\n