NFL Connections #72, Answers
The full solution: all four groups and the 16 names, sorted from the easiest group to the trickiest.
Houston Texans greats
J.J. Watt, Andre Johnson, Arian Foster, Duane Brown
Dallas Cowboys greats
Tony Romo, DeMarcus Ware, Jason Witten, Tyron Smith
Houston Oilers greats
Earl Campbell, Warren Moon, Bruce Matthews, Mike Munchak
Tennessee Titans greats
Steve McNair, Eddie George, Derrick Henry, Jevon Kearse