The ranking is based on percentage of points on the PP. Having low 5v5 points is basically a requirement.
RNH is scoring at over a point per game pace and is in the top echelons of overall scoring in the league. He has 15 PP points out of 30 points scored with only 3 PP goals out of 13. That is not low 5v5 points. You deposit points in the bank, not percentages.
I also assume you also include Hyman, Kane, Draisaitl and McDavid in that comment that we do not have any good 5v5 players.