Though most scores are neither advertised nor solicited on the actual campus, I only know of a couple of students who scored lower on step II than on step I. Their situations were similar: each of them crushed step I and would have been better-off waiting a while before taking step II. There was no benefit for them to take it early as they already boasted an impressive step I score. I don't know of any students at my school (not to say there aren't any) who did average on step I and worse on step II.