GOAT is a subjective measurement, there is no objective criteria. It can always be argued, that's the whole point. Here is a listing of how the defenses for Brady & some other recent All Time Great QBs stacked up in terms of points allowed ranking on a seasonal basis, with SB winning seasons bolded... Brady (AVG DEF 7.05) 6, 17, 1, 2, 17, 2, 4, 5, 8, 15, 9, 10, 8, 10, 1, 5, 7, 1, 8, 5 Rodgers (AVG DEF 16.46) 22, 7, 2, 19, 11, 24, 13, 12, 21, 26, 22, 9, 13, 13 Manning (AVG DEF 14.59) 29, 17, 15, 31, 7, 20, 19, 2, 23, 1, 7, 8, 23, 4, 22, 16, 4 Brees (AVG DEF 18.37) 22, 31, 11, 13, 13, 25, 26, 20, 7, 13, 31, 4, 28, 32, 31, 10, 14, 13, 5 Favre (AVG DEF 12.16) 15, 9, 5, 4, 1, 5, 11, 20, 14, 5, 12, 11, 23, 19, 25, 6, 18, 10, 18 Montana / Young (AVG DEF 5.67) 2, 23, 4, 1, 2, 3, 3, 8, 3, 2, 4, 3, 16, 6, 2, 4, 3, 13 Maybe Brady & Montana had some special sauce that set them apart from other ATG QBs, or maybe they consistently were paired with much better defenses. Again, I come down more on the side of the latter than the former, though I would never discount either entirely.