NFL Connections #58, Answers
The full solution: all four groups and the 16 names, sorted from the easiest group to the trickiest.
One-franchise QBs
Dan Marino, John Elway, Dan Fouts, Roger Staubach
One-franchise running backs
Walter Payton, Barry Sanders, Jim Brown, Gale Sayers
One-franchise receivers
Steve Largent, Larry Fitzgerald, Marvin Harrison, Hines Ward
One-franchise defenders
Ray Lewis, Jack Lambert, Derrick Brooks, Patrick Willis