NFL Connections #80, Answers
The full solution: all four groups and the 16 names, sorted from the easiest group to the trickiest.
Denver Broncos
John Elway, Terrell Davis, Champ Bailey, Von Miller
Kansas City Chiefs
Patrick Mahomes, Travis Kelce, Derrick Thomas, Tony Gonzalez
Las Vegas Raiders
Ken Stabler, Marcus Allen, Tim Brown, Howie Long
Los Angeles Chargers
Dan Fouts, LaDainian Tomlinson, Junior Seau, Antonio Gates