re: Predicting 2018 Vegas win totals for all 32 NFL teams

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but it's hard to believe it will remain a top-10 unit. Teams that improve as much as the Saints did -- they jumped from 31st to eighth in defensive DVOA -- often decline the following season.

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I see what they are saying but do teams that show that much improvement lose 6+ starters and multiple contributors to injury and not maintain the improvement once those key players return from injury or are replaced with healthy newcomers?