Yea, I don't see this inconsistency either. I suppose you could argue that his lead is mainly due to multigoal games, but that doesn't make him any less consistent than the other players really. Just even looking at games with a goal, Ovi has 25 in 50 games this year. Skinner has 24 in 49, Tavares 23 in 49, Point has 23 in 49, Gaudreau has 22 in 51, McDavid has 24 in 49, Kane has 19 in 50, and Landeskog has 23 in 50. His longest drought is a bit longer than some others, but it was only 6 games (conpared to 5 for Tavares, 4 for Skinner, and 7 for Point). Seems like pretty average consistency among the top scorers this year, he's just also put up more hattricks.
Compare that to Laine, who only has goals in 15 of 50 games, and has had 4 goalless streaks of 5+ games