NFL Connections #25, Answers
The full solution: all four groups and the 16 names, sorted from the easiest group to the trickiest.
Green Bay Packers greats
Brett Favre, Aaron Rodgers, Donald Driver, Jordy Nelson
Chicago Bears greats
Walter Payton, Dick Butkus, Mike Singletary, Brian Urlacher
Minnesota Vikings greats
Fran Tarkenton, Randy Moss, Alan Page, Adrian Peterson
Detroit Lions greats
Barry Sanders, Calvin Johnson, Matthew Stafford, Herman Moore