Yeah, so "balance" doesn't really matter on that chart, as cdcox said. The far right diagonal/tier are of course the best teams, and the further right you go, the better, since offense is more predictable (and important, obviously) than defense. Teams can be anywhere on that Bills/Bengals/Eagles diagonal and they're considered the same.
Or to put it another way, the Browns and Jets are the same, just for different reasons.
The Chiefs being almost to the next diagonal means they're better than everyone else. Yeah, hang your hat on "balance", but that chart is literally saying where the Bills/Bengals/Eagles are at on offense and defense doesn't matter because the Chiefs offense more than makes up for their defense.
Quote:
The grey tier lines create comparisons across teams. Teams on the same line are "equal" and expected to perform similarly on a forward looking basis. Because offensive performance is more predictive than defensive performance, these lines have a slope greater than 1 (1.6).
The tiers themselves represent the historical distribution of teams against the league average (median). For instance, a team at the "p90" line would be better than 90% of teams in any given year.
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https://www.nfeloapp.com/nfl-power-r...nfl-epa-tiers/