Bart Starr, Brett Favre & Aaron Rodgers
Jersey numbers:
15 + 4 + 12 = 31
The letters in their names:
9 + 10 + 12 = 31
Winning seasons in Green Bay between them:
8 + 13 + 10 = 31
Playoff wins between them as Green Bay’s starting QB (and played whole game):
8 + 12 + 11 = 31