NFL Connections #31, Answers
The full solution: all four groups and the 16 names, sorted from the easiest group to the trickiest.
Legion of Boom (Seahawks)
Richard Sherman, Earl Thomas, Kam Chancellor, Brandon Browner
Blitzburgh (2000s Steelers)
Troy Polamalu, James Harrison, Joey Porter, Casey Hampton
2015 Broncos defense (Super Bowl 50)
Von Miller, DeMarcus Ware, Aqib Talib, Chris Harris Jr.
2002 Buccaneers defense
Derrick Brooks, Warren Sapp, John Lynch, Ronde Barber