The Buffalo Bills are undergoing significant changes in their defensive strategy after parting ways with head coach Sean McDermott, primarily due to the team's inability to advance in the playoffs. Owner Terry Pegula highlighted the defense as a crucial area needing improvement, prompting the hiring of Joe Brady as the new head coach and Jim Leonhard as the defensive coordinator. Leonhard is set to implement a new 3-4 defensive scheme, which will require careful evaluation of the current roster during the offseason. Key defensive positions needing attention include the defensive line, outside linebacker, and cornerback. The Bills are expected to target specific players in the upcoming NFL Draft, with names like Kayden McDonald from Ohio State and Jacob Rodriguez from Texas Tech being potential picks to enhance their defensive capabilities. The team aims to solidify its defense to complement its strong offensive lineup, ensuring they can compete effectively in the postseason.