NFL Connections #60, Answers
The full solution: all four groups and the 16 names, sorted from the easiest group to the trickiest.
Heisman-winning running backs
Marcus Allen, Bo Jackson, Barry Sanders, Earl Campbell
Heisman-winning QBs
Cam Newton, Baker Mayfield, Kyler Murray, Jameis Winston
Heisman winners (other)
Charles Woodson, Tim Brown, Desmond Howard, Reggie Bush
Heisman QBs who flopped in the NFL
Tim Tebow, Johnny Manziel, Troy Smith, Matt Leinart