Players reaching NFL free agency are, by definition, players teams are prepared to lose.That has become clearer in the one month since 45 NFC West players became unrestricted free agents March 12. The Arizona Cardinals, St. Louis Rams, San Francisco 49ers and Seattle Seahawks have so far re-signed only two of the 45. Another UFA, Chris Williams, reportedly will re-sign with the Rams, although no contract has been filed to this point.At most, then, three of the 45 have been retained.