Posted by ESPN.com's Mike Sando
The investment has bought them the NFL's 22nd-ranked defense in yards allowed. Two teams have allowed more points than the 49ers this season (partially a reflection of turnovers). The 49ers' defense ranks high in red-zone percentage, but the overall performance hasn't met expectations.
Where NFC West defenses finished in yards allowed last season: Seattle 15, Arizona 17, St. Louis 21 and San Francisco 25.