NFL Connections #23, Answers
The full solution: all four groups and the 16 names, sorted from the easiest group to the trickiest.
Kansas City Chiefs greats
Derrick Thomas, Tony Gonzalez, Will Shields, Bobby Bell
Denver Broncos greats
John Elway, Terrell Davis, Steve Atwater, Randy Gradishar
Raiders greats
Howie Long, Tim Brown, Ken Stabler, Cliff Branch
Los Angeles Chargers greats
LaDainian Tomlinson, Junior Seau, Dan Fouts, Antonio Gates