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Barry Sanders is, obviously, choice #1. Someone who sees a DT looming immediately when he gets the ball, *zwoop* makes him miss, and then doesn't have to worry about him any more. Barry, of course, was elite amongst elites and would have succeeded behind any line, but the characteristics he showed are what make a good back behind a bad o-line. In order:
Vision, elusiveness, acceleration, speed, deciseiveness.