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This is interesting work, I like studies like this. But if you'd done your studies in a different sequence, I think you might have reframed your conclusions.
- if first you had found that initial Potential is the best predictor of future success
- then you found that initial Potential was correlated with Desire for Winner and Work Ethic in your sample
and you then formulated a hypothesis about whether Work Ethic and Desire for Winner would be correlated with future success, naturally you'd hypothesize they will be, in your sample, because they're correlated with initial Potential. So that's not a surprising finding, and doesn't say anything about whether Work Ethic or Desire for Winner contribute to future success (independent of their correlation with Potential).
What I think you'd want to do is do a multiple regression where you regress on the log of initial Potential and on WE and Desire for Win (or some transformation of those), and check your p-values to see if WE or Desire for Win have any provable predictive value independent of Potential.
Based on what I know of the game, Desire for Winner shouldn't be part of the player development model at all (though Work Ethic is), which is what makes me think this correlation between Desire for Win and Potential is the only explanation for your findings (unless there's some bug in the dev code no one has noticed).
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