It was a somewhat unusual season for the Legion of Boom, as the Seahawks' secondary again was one of the best in the NFL but had a few uncharacteristic setbacks and hurdles to overcome.

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The secondary had the most surprisingly turbulent season among the Seahawks’ position groups in 2015.

From Kam Chancellor’s holdout that lasted through the first two games, to Cary Williams’ benching and release — not to mention some simply uncharacteristic play along the way — it was a season in which the Legion of Boom at times seemed to be living on reputation as much as production.

When the dust settled, though, the stats were similar to those from previous seasons — the Seahawks were second in the NFL in pass defense at 210 yards allowed per game, and they allowed fewer passing touchdowns in 2015 (14) than in 2014 (17) or 2013 (16).

Still,  it felt different at times.

Position review:

As we continue our daily breakdown of the Seahawks’ position groups, here’s a closer look at the secondary:

Starters: Cornerback Richard Sherman

Age: 27.

Snaps played: 975 (of 995 total).

Contract situation: Signed through 2018.

2015 stats: Two interceptions for 30 yards.

Cornerback Jeremy Lane

Age: 25.

Snaps played: 250.

Contract situation: Unrestricted free agent.

2015 stats: Two interceptions for 60 yards.

Strong safety Kam Chancellor

Age: 27.

Snaps played: 635.

Contract situation: Signed through 2017.

2015 stats: Two interceptions for six yards.

Free safety Earl Thomas

Age: 26.

Snaps played: 978.

Contract situation: Signed through 2018.

2015 stats: Five interceptions for 67 yards.

Backups: Cornerback DeShawn Shead

Age: 27.

Snaps played: 616.

Contract situation: Exclusive-rights free agent.

2015 stats: One interception for 40 yards.

Cornerback Marcus Burley

Age: 25.

Snaps played: 203.

Contract situation: Exclusive-rights free agent.

2015 stats: One interception for no yards.

Strong safety Kelcie McCray

Age: 27.

Snaps played: 220.

Contract situation: Signed through 2016.

2015 stats: Team-high 12 tackles on special teams.

Safety Steven Terrell

Age: 25.

Snaps played: 16.

Contract situation: Exclusive-rights free agent.

2015 stats: Three special-teams tackles.

Cornerback Tye Smith

Age: 22.

Snaps played: Played only on special teams, in three games.

Contract situation: Signed through 2018.

2015 stats: One special-teams tackle.

2015 review

Typifying the different kind of year it was for the secondary, two of the four season-opening starters — strong safety Dion Bailey and Williams — aren’t listed, both long gone by the time the postseason had arrived.

Bailey filled in initially for Chancellor, whose holdout contributed to the Seahawks’ 0-2 start — and likely played a role in some later breakdowns “in terms of continuity and communications and stuff like that,’’ coach Pete Carroll said, citing the blown coverage that led to Carolina’s winning touchdown in Week 6.

Chancellor had some big moments after he returned, but he didn’t seem to make as much of a consistent impact as in the past. Then he missed the last three games because of a pelvis injury that lingered into the postseason (he pulled out of this week’s Pro Bowl to rest, as did Thomas). McCray, acquired in a preseason trade with Kansas City, filled in for Chancellor and generally acquitted himself well.

Williams, after a few good games early (he actually won Jon Gruden’s Grinder award for the Monday night win over Detroit) struggled at midseason and was benched during the Nov. 22 game against the 49ers. He did not play again, replaced by Shead and then Lane he returned from knee and wrist injuries suffered in the Super Bowl.

Those moves seemed to solidify the secondary, which allowed just three passing touchdowns in the last five games after giving up 11 in the first 11.

Thomas had surgery last February to repair a torn labrum suffered in the NFC title game a year ago and didn’t play in the preseason. But he played all but 17 snaps during the season and led the Seahawks with five interceptions, which tied a career high.

In part due to some of the early personnel issues, Sherman was asked to do more than ever, assigned to cover San Francisco’s Torrey Smith, Dallas’ Dez Bryant and Pittsburgh’s Antonio Brown.

Sherman had just two interceptions but finished with the third-lowest yards-per-coverage snap allowed (0.73) according to Pro Football Focus.

Shead did yeoman’s work in playing cornerback, nickel and some safety throughout the season, and Lane played well once he found his stride down the stretch.

Burley again was a solid backup at nickel despite suffering a broken thumb against Detroit that caused him to miss three games.

Smith, a fifth-round draft pick in 2015, was active for six games but did not play a defensive snap.

Grade: B. The overall numbers were sterling as ever. But the secondary has set an incredibly high standard, and the Seahawks came up just short at times while playing a few games with an unforeseen personnel situation.

Offseason objectives

Though Chancellor remains under contract for two more years, his situation is unclear. He held out and missed two games but came back without any changes to his deal. Will he return happily in the fold in 2016 under the terms of his existing contract? The Seahawks will want to figure that out quickly this offseason and prevent anything that lingers — recall that the team apparently wasn’t aware of any issues last year with Chancellor until summer.

Chancellor’s salary-cap hits go up to $6.1 million and $8.1 million the next two years (with the dead money of just $2 million and $1 million, respectively). The play of McCray in the three games Chancellor missed at the end of the season might factor in to how the team deals with Chancellor.

Other than smoothing things out with Chancellor, the biggest priority is solidifying the other cornerback spot. Lane is an unrestricted free agent and indicated he plans to test the market.

Not mentioned above but likely factoring into the Seahawks’ decisions are Tharold Simon and Mohammed Seisay, who both missed this season while on injured reserve. Both, along with Smith, are regarded by the team as potentially competitors at that spot.

Shead and Burley are each exclusive-rights free agents, meaning the Seahawks can essentially guarantee their return by making a qualifying offer by March 9.

Up next: Special teams.

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