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The performance translation formulas are only as good as their fit to actual human performance data. Since no single human will hold all the WR from 800m to Marathon, its impossible to know if the formula really fits human performance. Instead the formulas fit a cross section of different humans and their best performances. So the accuracy of any formula is largely subjective.

The only way to rank someone's range is to see how close they are to the WR across multiple events. You are right that Kipchoge's range and longevity is truly amazing.

The only empirical way to judge a WR performance is to see by how much it beat a previous WR and how long the WR stands, while also considering how often the event is contested by the world's best athletes. So in a sense, you only truly know how good a WR is after it's been broken, it's kind of a Schrödinger's cat situation.

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