NFL: Does Offense Really Take Longer To Gel Than Defense?

The conventional wisdom says that defense is ahead of offense during the early part of the NFL season. I have always doubted that assertion, or at least the absolute confidence that NFL analysts have in the assertion. The table below compares total yards per game during the first two games of the regular season to rest of the season’s total yards per game. If during the first two games of the season, the league averaged 600 yards/game and during the rest of the season the yards/game was 500, then the score would be 1.20. A score of 1.00 means there’s no difference.
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NY is the source of the photo.