Seahawks still in search of left tackle, waiting on Russell Okung

A breakdown of the first week of free agency for the Seattle Seahawks.

Most significant signing: The Seahawks were able to retain cornerback Jeremy Lane on a four-year, $23 million deal and solidify their secondary. Even though Russell Wilson was fantastic in 2015, the identity of Pete Carroll's teams will always be the defense. Last offseason, the team swung and missed with the signing of cornerback Cary Williams, who was released late in the year. Lane will be only 26 when next season begins and has the ability to play both right corner and nickel. The Seahawks now have cornerback Richard Sherman, free safety Earl Thomas, strong safety Kam Chancellor and Lane signed through the 2017 season. That's great stability for a defense that has led the NFL in fewest points allowed for four straight seasons.

Most significant loss: Both parties had to know that their partnership was going to come to an end, but losing linebacker/defensive end Bruce Irvin to the Oakland Raiders is still significant for the Seahawks. Many point to Irvin's ability to rush the passer, but really it's his versatility that will be difficult to replace. Irvin lined up at outside linebacker in the Seahawks' base defense and put his hand in the ground as a defensive end in sub packages. He could rush the passer, set the edge in the run game and drop in coverage. The team has yet to sign a player capable of replacing Irvin.

Player they should have signed: They could have taken a flier on Green Bay Packers outside linebacker/defensive end Nick Perry. Perry ended up re-signing with Green Bay on a one-year, $5 million deal. He has a base salary of $2.3 million and got a signing bonus of $1.5 million. Perry is a tremendous athlete who is familiar with Carroll's scheme from his days at USC. He could have helped replace Irvin and been a backup to Cliff Avril at the Leo spot. Given that Perry will be only 26 when next season begins, the Seahawks could have signed him to a longer-term deal with more guaranteed money than he received from the Packers.

What's next: The biggest question still facing the Seahawks is what they're going to do at left tackle. Russell Okung remains on the market. Okung has visited the New York Giants, Detroit Lions and Pittsburgh Steelers, but has yet to make a decision on where he will sign. He appears to be the Seahawks' top target, but if Okung signs elsewhere, the team doesn't have a lot of options. Kelvin Beachum is headed to Jacksonville, and Donald Penn has reportedly agreed to terms to remain with the Oakland Raiders. They could go with an out-of-the-box idea, such as targeting Joe Thomas in a trade. The Seahawks have signed journeymen offensive linemen J'Marcus Webb and Bradley Sowell, but neither is an adequate option to replace Okung. Figuring out a solution at left tackle is No. 1 on general manager John Schneider's to-do list.

Overall grade: B. It really should be an incomplete, because evaluating the Seahawks' moves in free agency is difficult without knowing the plan at left tackle. But they brought back Lane, defensive tackle Ahtyba Rubin and wide receiver Jermaine Kearse on reasonable deals. They took fliers on some lesser known guys such as Webb, Sowell and nose tackle Sealver Siliga. And they did not spend foolishly. There are still holes to be filled, but the roster is set up nicely to make a Super Bowl run in 2016.