NFL Connections #52, Answers
The full solution: all four groups and the 16 names, sorted from the easiest group to the trickiest.
Hall of Fame defensive tackles
Joe Greene, Randy White, Warren Sapp, John Randle
Hall of Fame defensive ends
Bruce Smith, Chris Doleman, Jason Taylor, Howie Long
Hall of Fame linebackers
Junior Seau, Derrick Brooks, Brian Urlacher, Derrick Thomas
Hall of Fame defensive backs
Deion Sanders, Ronnie Lott, Rod Woodson, Ed Reed