I think Russell Wilson is always going to be a qb who is better than his numbers indicate. I agree that early Brady depended a great deal on the defense, but I surmise even early Brady was more than a placeholder which is what I think a qb like Dilfer or Johnson was. Again, if you have a superlative defense, you can get by with lesser qb play. I still say, in agreement with most of your interlocutors, that stellar qb play, on balance, allows for much more wiggle room when assessing long term success.