Usually, when a team wins 13 games, it does so with balance and consistency throughout the season. A good offense and defense work off each other, complementing one another and making the other more effective.
The Green Bay Packers are a lesson in inconsistency this season, across all parts of the football team. Pro Football Reference calculates an expected points added value for each game based on offense, defense, and special teams, and Green Bay is a curious case this year. Only three times all season have both the offense and defense finished in the positive — in wins over the Broncos (week 3), Lions (week 6), and Washington (week 14).