In a series of articles during the next few days, Football Outsiders will be looking division-by-division at the biggest weakness left on each team's roster after free agency and the 2015 NFL draft.
This edition examines the NFC West.
Arizona Cardinals
Biggest post-draft weakness: Offensive line
This is going to create some controversy. Some observers tabbed Arizona's line as one of the most improved units in the NFL. The Cardinals signed three-time Pro Bowler Mike Iupati away from San Francisco in free agency and then spent their first-round draft choice on Florida's D.J. Humphries.