So much anticipation surrounded the San Francisco 49ers heading into their Week 18 showdown with the Seattle Seahawks. The game was expected to be a high-stakes battle, but it turned out to be a major disappointment for the 49ers. Their six-game winning streak came to an end with a 13-3 loss to the Seahawks. Let’s break down the seven most significant takeaways from this game.

49ers Run Defense

The 49ers’ run defense was a major concern throughout the game. It became evident early on that the defense would struggle to contain the Seahawks’ running game. In the first quarter alone, they allowed 88 yards on the ground, and by the end of the game, they had given up 180 total rushing yards.

This lack of stopping the run was a key factor in the loss. Defensive coordinator Robert Saleh couldn’t find the right strategy to limit Kenneth Walker and Zach Charbonnet. Even when he did, the players failed to execute. This was one of the worst tackling performances by the 49ers this season, if not in recent years. A brutal showing overall.

3rd-and-17 Run Allowed Was the Dagger

The final blow to the 49ers’ hopes came in the fourth quarter when they allowed a 3rd-and-17 conversion. The Seahawks executed a shotgun sweep play to Walker, which is typically a sign that the offense is throwing in the towel. Converting on 17 yards is extremely difficult, yet the Seahawks made it look effortless.

The 49ers’ defense was completely unable to make a tackle, and it ultimately sealed their fate. This moment highlighted just how ineffective the defense was in critical situations.

Malik Mustapha and Ji’Ayir Brown Woes

Malik Mustapha and Ji’Ayir Brown were once again a source of frustration for the 49ers. Both players struggled in pass coverage and were ineffective as run defenders. One of the most glaring examples came on the first touchdown allowed. Brown was easily beaten by a backup tight end, allowing Zach Charbonnet to break free.

This created a one-on-one matchup with Mustapha, who missed the tackle entirely, leading to an easy touchdown. This kind of performance has become all too common for the pair, and it’s an issue that needs to be addressed during the offseason. Adding depth at the safety position should be a priority.

Brock Purdy’s Rude Awakening

Brock Purdy wasn’t terrible in this game, but he certainly wasn’t at his best. His performance was a far cry from the strong play he showed in the previous four games. The reason for this decline was that Purdy wasn’t given the time to throw that he usually gets.

He was forced to get the ball out quickly, and there were several instances where he held onto the ball too long, resulting in sacks. This was a wake-up call for Purdy, as he faced a formidable defense for the first time this season.

Amnesia to the Running Game

Christian McCaffrey has been a standout performer in recent games, but Kyle Shanahan didn’t seem to trust him in this matchup. In the first half, McCaffrey only received three handoffs. While the Seahawks have a solid run defense, this lack of effort to establish the run was surprising, especially given McCaffrey’s recent success.

It’s clear that Shanahan didn’t fully commit to the running game, which left the offense struggling to find its rhythm.

Mike Macdonald Schools Kyle Shanahan

Seahawks coach Mike Macdonald, who calls the defensive plays, outmaneuvered Kyle Shanahan throughout the game. This isn’t a new occurrence; it happened two years ago when the 49ers faced the Baltimore Ravens. Macdonald has proven time and again that he knows how to beat Shanahan, especially in high-pressure situations at Levi’s Stadium.

49ers Will Not Make the Super Bowl

Even if the 49ers managed to secure the No. 1 seed, their chances of making the Super Bowl are slim. Their defense has been inconsistent, and without key players, it’s hard to see them competing at the highest level. The offense hasn’t been able to carry the team, as demonstrated in this game.

With their defense struggling and the team playing with “free money” this season, any future wins will feel unearned. This loss marks a turning point for the 49ers, and it’s clear that their season may be coming to an end sooner than expected.