NFL Connections #61, Answers
The full solution: all four groups and the 16 names, sorted from the easiest group to the trickiest.
Super Bowl-winning coaches (recent)
Andy Reid, Sean McVay, Doug Pederson, Nick Sirianni
Dynasty masterminds
Bill Belichick, Bill Walsh, Chuck Noll, Vince Lombardi
Hall of Fame coaches (classic)
Tom Landry, Don Shula, George Halas, Paul Brown
Super Bowl-winning coaches (2000s)
Jon Gruden, Bill Cowher, Tony Dungy, Tom Coughlin