These ratings change pretty quickly once actual snaps occur. If I'm picking a couple to be risers by the midpoint of the season, I'm going with Donte Moncrief (currently a 78 overall) and Robert Nkemdiche (currently a 75). Of course, rookies can move around ratings-wise since they're all pegged in about the same area to begin. There's also the aspect of these being our guys, so we think naturally they should be rated higher than they are currently.
This seems like a good point to mention how much I miss the second week of July being special when NCAA Football came out each year.