Looking at both the Restricted and Un-Restricted Free Agents at the end of the season it appears that the Seahawks are in a really sweet position - especially when compared to last year when the Hawks had Bennett, Tate, Giacomini, McDonald, Haushka and a couple others entering free agency.
There is only one player close to a "Must Keep" and that is Byron Maxwell. I don't think that Seahawks will be able to keep Byron because Byron will be able to command a Significant contract from a number of conerback starved teams.
Other than Maxwell the Seahawks will probably want to lock up Schilling for a while longer.
https://www.profootballfocus.com/blog/2014/12/25/2015-free-agents-seattle-seahawks/
2015 Free Agents: Seattle Seahawks
Name Age Pos Rating Snaps
Jeron Johnson 27 S SEA UFA 1.4 98
Greg Scruggs 25 DI SEA RFA 0.6 68
O'Brien Schofield 28 ED SEA UFA 0.4 341
Tony Moeaki 28 TE SEA UFA 0.2 206
Anthony McCoy 27 TE SEA UFA 0 0
Tarvaris Jackson 32 QB SEA UFA 0 3
Heath Farwell 33 LB SEA UFA 0 0
D'Anthony Smith 27 DI SEA UFA 0 0
Byron Maxwell 27 CB SEA UFA -0.2 717
Kevin Williams 35 DI SEA UFA -0.3 445
Bryan Walters 27 WR SEA RFA -1.2 108
Demarcus Dobbs 27 DI SEA UFA -1.3 118
Michael Morgan 27 LB SEA RFA -2.1 27
Steve Schilling 27 C SEA RFA -2.2 205
Clint Gresham 29 LS SEA UFA -5 142
Jermaine Kearse 25 WR SEA RFA -5.2 821
Will Tukuafu 31 FB SEA UFA -5.9 160
James Carpenter 26 G SEA UFA -6.6 846
Lemuel Jeanpierre 28 C SEA UFA -7.1 227
Malcolm Smith 26 LB SEA UFA -9 286