The one thing you need to remember when looking at RLR, is that this is really the only source you get of one core group of scouts opinions.
THN and CSB are all on average, basically a blended consensus of numerous scouting groups - which tends to give you a better overall look at ratings (sometimes). With RLR, given it is such a small group of scouts (similar to a NHL team for example), you tend to get a much different look and opinion.
But that's the interesting thing about their reports - NHL team's lists will change just as dramatically during the season, and in the end, some may have Schemp as top 5, and some (like RLR) being unlikely to use a first round pick on him.