The Seahawks have informed LB Isaiah Kacyvenski that they plan to release him. The move will clear the way for Seattle to sign RB Marquis Weeks to the active roster in time for the Seattle-Chicago game Sunday night. Weeks will then serve as the backup to Maurice Morris on Sunday night. Kacyvenski has been a valued special-teams player in Seattle since 2000. He has played in 90 games. Anaylsis: The Seahawks could always attempt to re-sign Kacyvenski once starting RB Shaun Alexander is healthy again. He was the seventh linebacker on a very good team — a team with great starting-caliber depth at linebacker. That is the cold reality. The human side is well known; any locker room would be better off with a player such as Kacyvenski.