NFL Connections #48, Answers
The full solution: all four groups and the 16 names, sorted from the easiest group to the trickiest.
Super Bowl MVP running backs
Emmitt Smith, Terrell Davis, Marcus Allen, Ottis Anderson
Super Bowl MVP receivers
Lynn Swann, Fred Biletnikoff, Hines Ward, Julian Edelman
Super Bowl MVP on defense
Richard Dent, Ray Lewis, Von Miller, Chuck Howley
Super Bowl MVP quarterbacks
Joe Flacco, Doug Williams, Eli Manning, Steve Young