Who are this year's greatest overachievers? As one way of answering that, I compared everyone's points (as of March 15) to their three-year average points per game multiplied by the number of games they have played. 
I found that William Karlsson, Nathan MacKinnon, and Mikko Rantanen were on top, and ahead of the pack.
+42.9 W. Karlsson+42.0 MacKinnon+39.2 Rantanen+29.4 Perron+29.0 Bailey+28.6 Marchand+28.0 Kucherov+27.5 Couturier+27.1 Haula+27.0 Hall+26.6 Marchessault+25.5 R. Smith+24.9 Terava...