Yes, that ~7% scoring disparity between the leagues is super crucial in this argument.
Obviously, Tolvanen is having a hard time transitioning to the small ice even though he played great in all competitions last year whatever opposition he faced - be it KHL, WJC, OG or WC. The fact that you are trying to make some end-all definitive conclusion about the strength of the league based on a single undersized 19-year-old is laughable. Kaprizov has 17 points in 24 games. Kane had 2 in 12. Dadonov is top line wing in the NHL when his linemate, whom most considered to be more talented, didn't make the NHL at all. If all those things don't tell you it's more complicated than "can we put to bed this idea that the KHL is the 2nd best league in the world because Tolvanen doesn't score in the AHL" I don't know what to tell you other than maybe you should educate yourself on the subject before talking about it.
Not to mention that the last time you saw Dawes play was probably 2010 or so.