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i know one reason for the desparity is grades. i've been told before that scout assumes everyone will qualify and that rivals ususally only ranks guys high if/once they do qualify. there are some exceptions here and there for the great athletes (usually the top 100 or so guys), but guys like the ones on the list ususally get rewarded with better rankings when they qualify.
also, sometimes guys develop a relationship with one site over the others, and that is where they will then send their tapes and highlights. since the sites don't share much, they are ranked lower. then if a guy like Jamhal Brown commits to tOSU or something, the site that doesn't have much on him scrambles to evaluate and get him a deserving ranking.
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