Insider: Top needs for NFC North teams

The Chicago Bears desperately need another wide receiver besides Brandon Marshall. Brace Hemmelgarn/USA TODAY Sports

Welcome to the 2013 version of Insider's offseason staple series: Plugging the Holes. This marks the sixth of an eight-part examination in which Football Outsiders identifies the biggest needs for every NFL team, division by division, going into the 2013 offseason.

The series continues Tuesday with Outsiders' look at the NFC North.