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Closers make nice money, sure.
But that becomes a quibble, because there is still a difference between what star SP's and star closers get in terms of overall contract value. It's not only a statistically significant difference; it's a very large difference.
Tweak the ratios on the $/WPA, so they don't look quite so ugly, and you're still left with the basic problems.
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And we are NOT talking about Aumont being converted to closer. They just assigned that job to their #5 overall. SP-vs-setup is the relevant comparison.