re: 5* Chidi Valentine-Okeke commits to LSU

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1) The point is that Grimes' effect on the offensive line's performance cannot be isolated from the effect of the overall team decline. In other words, we cannot be sure how much of the decline in performance was caused by Grimes because every position unit on the team declined. Thus, there is no cross-unit variance to assess.

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It also just so happens that there is a plausible alternative explanation: That the head coach was responsible for the decline in every unit on the team.