The Seahawks essentially were forced to cut Trufant because of his high salary, and he wasn't able to find a big deal on the open market, which continues this year's trend of free agents finding demand for their services underwhelming before finding the best contract with their original teams (other examples: Paul Soliai, Alex Smith, Reggie Wayne, Stephen Tulloch and John Abraham).
This is an ideal situation for a Seahawks team that is building a strong young secondary. Trufant is an injury risk, but the team might be able to limit his snaps behind underrated cornerback starters Richard Sherman and Brandon Browner. The team also has a Pro Bowl safety tandem in Earl Thomas and Kam Chancellor. Few teams have such depth in the defensive backfield.