There's never really been parity in the NFL. Every year there's at least one team that wins 75% of their games and at least one team that loses 75% of their games. There's less parity in the NFL than any other sport. There are, however (assuming Minnesota wins), six 3-1 teams, two 2-1 teams, seven 2-2 teams, a 1-2 team, five 1-3 teams and an 0-3 team. So, really, 4 games into the season the distribution is pretty standard. I guess. I just don't remember the last time 1/3 of the league was either 4-0 or 0-4 after four weeks