Seattle general manager John Schneider and coach Pete Carroll have collaborated to make over 500 roster moves since arriving in Seattle together in January 2010. This offseason was no different as the Seahawks dove head first into the deep end of the free agency pool. Here’s a look at a few of the key pickups:

The Best Free-Agent Additions (with signing date):

QB Matt Flynn (March 18, Packers):
The crown jewel of the Seahawks free agency class is Flynn, who Carroll brought in to compete with Tarvaris Jackson and rookie Russell Wilson for the starting quarterback job. Flynn, who signed on March 18, has acquitted himself well in camp so far. Things should start to get really interesting next week when Carroll has to name a starter for the Seahawks preseason opener against Tennessee.

DT Jason Jones (March 18, Titans) and LB Barrett Ruud (April 6, Titans):
Although the Flynn signing got most of the publicity, the Seahawks also signed two potential defensive starters in Ruud and Jones, who both played for Tennessee last season. The same Tennessee team that Seahawks open the preseason with on Aug. 11. Jones has been a solid addition who’s expected to start right away while Ruud is competing with second round pick Bobby Wagner to replace Seahawks leading tackler David Hawthorne, who signed with New Orleans.  


The Best of the Rest:

G Deuce Lutui (April 6, Cardinals), OT Alex Barron (May 16, 2010, Cowboys) and OT Frank Omiyale (March 21, Bears): 
The Seahawks spent the offseason beefing up their offensive line. The best addition is Omiyale, who the Seahawks desperately needed with news that James Carpenter (ACL) may not be available early in the season. Omiyale will be a quality backup at left tackle for Russell Okung. The Barron signing could certainly pay off if the 6-year veteran can get back to his 2009 form. Barron, the 19th overall pick of the Rams in the 2005 draft, started all 16 games for the Rams in 2009, his last season there. However, he only started one game for the Cowboys in 2010. He spent the 2011 season on the Saints IR. Lutui is the wild card; he failed a physical after signing with the Bengals in 2011. He looked a little big in training camp, but if he can carry his weight, he’ll make an adequate backup for right guard John Moffitt.

RB Kregg Lumpkin (March 23, Buccaneers):
Lumpkin came into the league with the Packers in 2008, coincidentally; GM John Schneider was working for the Packers then too. Schneider obviously likes what he sees in Lumpkin, the Seahawks made a waiver claim for him before the 2010 season, but he ended up in Tampa Bay. With the Marshawn Lynch DUI situation still up in the air, Lumpkin provides needed depth for the Seahawks in case beast mode goes into suspension mode.

WR Braylon Edwards (Aug. 1, 49ers) and WR Antonio Bryant (July 26, 2009 with Buccaneers):
Wide receiver depth has been an issue for the Seahawks since the day Pete Carroll arrived. Last year the Hawks went after and signed Sidney Rice. This year, the team signed Edwards and Bryant. The two aging veterans will be hard pressed to make the team, but they do provide experience that the Seahawks young receiving corps lacks. Carroll may decide to keep one of them for the experience factor alone. 

Note: Tight end Kellen Winslow isn't included on this list because the Seahawks traded for him rather than signing him through free agency. Winslow, who had 75 catches for 763 yards last year for the Bucs, has looked good in camp and provides instant depth at tight end. 

For more up-to-the-minute news and analysis from Seahawks blogger John Breech @JohnBreech, follow@CBSSportsNFLSEA.