The San Francisco 49ers are introducing a new defensive scheme under first-year defensive coordinator Raheem Morris, a significant shift from their long-standing four-down front. This evolution includes the frequent use of a fifth player at the line of scrimmage, a tactic designed to create pre-snap confusion for opposing offenses.
This change marks a departure from the defensive system that has been largely consistent throughout head coach Kyle Shanahan's tenure. Morris, who comes from a different coaching tree, is implementing a scheme that has seen a rise in popularity across the NFL. Quarterback Brock Purdy noted the difference, stating, "Now it’s like, we’ve got five down. He gives us all these different kinds of looks. The shell is always changing."
The addition of a fifth defender at the line requires versatility, with players needing the ability to rush the passer or drop into coverage. Offensive players, including Purdy, have expressed appreciation for the challenging looks provided during training camp, seeing it as valuable preparation for facing similar schemes in the league.
Morris, who previously served as the Los Angeles Rams' defensive coordinator from 2021 to 2023 and helped them win Super Bowl 56, is familiar with this approach. His experience as the Atlanta Falcons' head coach for the past two seasons has also aided his integration with the 49ers' roster.
Despite the new scheme, Morris emphasized that the defense is being built around the existing talent and the team's established strengths. He stated, "This is not, like, my defense, right? This is a defense we’re building for the Niners and what we already have in place, what they’ve done and what I want to be a part of."
Veteran players like linebacker Fred Warner acknowledged that while the scheme is evolving, the team's core playing style remains. "We’re not happy with anything that we’ve done or accomplished. It’s always about seeing where we can get better everyday," Warner said.
The 49ers' decision to evolve their defense comes after a season where they struggled with pass rushing, recording the fewest sacks in the NFL with 20, and forcing turnovers, ranking 23rd with 16. The team also faced significant injury setbacks, losing key players like Nick Bosa, Fred Warner, and Mykel Williams for portions of the season. The return of these players, along with additions like Dre Greenlaw, is expected to bolster the defense.
General manager John Lynch acknowledged the team's shortcomings last season, stating, "We weren’t good enough last year. There’s a lot of reasons for that, but ultimately all those reasons are just excuses, so you have to address it."