I actually think PDO was originally or best used as a statistical second opinion on players. It allows a quick look at a guy who had an uncharacteristically bad or good season to see if they really broke out or really declined or if you should expect him to revert to his previous form. Really useful to find undervalued guys or know when to stay away from a mirage. It's only a measure of luck if you have a baseline to compare it to.
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