Huh? NHL goals per game were an all-time high of 4.01 in ‘81-‘82, the year Gretzky had record 92 goals. The bulk of his career was >3.5 gpg.
Ovi’s entire career has been between 2.65 and 3.14 gpg. He played in a way more defensive league than Gretzky, with better goalies and the neutral zone trap.