Some Kansas City Chiefs fans are really nervous right now.If they were following the team in the early 2000s under head coach Dick Vermeil , they remember the 2003 season, when the Chiefs had an unstoppable offense coupled with a poor defense.That combination was sufficient to bring the Chiefs to the postseason with a 13-3 record that assured a first-round bye.But then came the infamous No-Punt Game against Peyton Manning and the Indianapolis Colts.The Colts scored on every one of their drives, and the Chiefs scored on every one of theirs — except for one drive ending with a missed Morten Anderson field goal, and another ending with a fumble by Priest Holmes.It added up to a 38-31 victory for the Colts.It would be a dozen years before the Chiefs returned to the divisional round of the playoffs.And now, some Chiefs fans are worried it’s happening all over again.So I thought I’d see if there’s really anything to be worried about.I picked seven commonly-used statistical categories to compare the 2003 and 2018 Chiefs on both offense and defense.Because the two seasons are separated by 15 years — and more than a little has changed in the NFL since then — I’m going to show you the bare stats, but no rankings.Instead, I’ve calculated standard deviations from average for each of these statistics, and they will be expressed as letter grades — just as we do in our True Power Rankings roundup every week.This solves two problems.First, comparing these stats with these letter grades allows us to compare these stats across the 15-year span between them; that’s one of the cool things about using standard deviations from average to compare them.Second, we won’t get ourselves worked up about differences in rankings that might not really be significant.If none of this makes sense to you, read the final part of the TPR methodology — the part with the equal-distribution graph.Or... just remember the rule: unless a grade is at least a full letter grade better (or worse) than another, the difference between the underlying stat is measurable, but not significant.Kansas City Chiefs 2003 and 2018Wow.Are you breaking out in a sweat yet?I know I am.As you can see, the statistical parallels between these two Chiefs seasons are striking.Every single one of these 2003 statistics is within a full letter grade of its 2018 counterpart — except for defensive yards given up, which is worse than 2003.So looking at this data, you can’t really blame anyone who has already concluded that the Chiefs will have a very successful regular season , and then fall by the wayside to some wild-card team — simply because the Chiefs defense isn’t up to the challenge of the postseason.But it’s not time to give up on this season — not by a long shot.I say this not because I have a fan’s faith that the Chiefs defense will improve.

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