NFL Connections #2, Answers
The full solution: all four groups and the 16 names, sorted from the easiest group to the trickiest.
Dallas Cowboys greats
Roger Staubach, Troy Aikman, Emmitt Smith, Michael Irvin
San Francisco 49ers greats
Joe Montana, Jerry Rice, Steve Young, Ronnie Lott
Pittsburgh Steelers greats
Terry Bradshaw, Franco Harris, Jack Lambert, Lynn Swann
Green Bay Packers greats
Bart Starr, Ray Nitschke, Paul Hornung, Jim Taylor