NFL Connections #102, Answers
The full solution: all four groups and the 16 names, sorted from the easiest group to the trickiest.
Steelers quarterbacks
Terry Bradshaw, Ben Roethlisberger, Kordell Stewart, Neil O'Donnell
Steelers running backs
Franco Harris, Jerome Bettis, Le'Veon Bell, Willie Parker
Steelers pass catchers
Lynn Swann, John Stallworth, Hines Ward, Antonio Brown
Steelers defensive legends
Joe Greene, Jack Lambert, Troy Polamalu, T.J. Watt