Additional analysis on Ovechkin vs. O6-era stars.
The basis of the analysis is the fact that in 1944-1968, the goal-scoring title winner led #5 in goals, on average, by 45%, and in 1997-2018, the goal-scoring title winner carried a similar lead (44%) over #10. Thus, for the O6-era players I am comparing % leads over #5 with Ovechkin's % leads over #10
Ovechkin 63-61-52-52-50-44-43-30-26-15-6
Richard 79-62-61-59-42-31-31-8-6-4
3-year peak and 5-year peak go Richard's way, the rest of the career is Ovechkin by probably an even bigger margin, but here is a caveat: Richard's best season, with 79% lead over #5, happened in 1944/45, when many players were in the army. If one assumes that with those players present he would have had a smaller margin of victory, say, 50%, then the 5-year peaks of Ovechkin and Richard become indistinguishable (and the rest of the career is Ovechkin by a landslide).
Thus, I think that with the current season under the belt, Ovechkin has passed Richard for sure.
Then there is Howe and his numbers
Gordie Howe 81-74-65-42-31-30-27-15-10-3-0
Ovechkin 63-61-52-52-50-44-43-30-26-15-6
Three-year peak is Howe for sure, 5-year peak still Howe, but it is close, and then the amazing happens and Ovechkin clearly beats Howe in terms of longevity as a top goal-scorer.
One way to compare the longevity against the superior peak is to break it this way:
3-year peak
Gordie Howe 81-74-65
Ovechkin 63-61-52
Tail-end of the career
Gordie Howe 42-31-30-27-15-10-3-0
Ovechkin 44-43-30-26-15-6
And then Ovechkin has two dominant goal-scoring title wins with 52% and 50% margin that went unmatched.
The tail ends cancel out - Howe has two more marginal top5 finishes, which would be a tad better than Ovechkin's 16/17, when he was 1 goal behind #10, but the second season in the series is Ovechkin's way by a good margin.
So the question is, 81-74-65 or 63-61-52-52-50? Would you have an even more dominant peak Ovechkin (plus 7-8 goals to his 65-goal season) for three years or would you rather have two extra dominant goal-scoring titles? This is not an easy choice; you can go all in and think that an improved version of peak Ovechkin wins you all there is to win in three years or you can play safe and have two more awesome goal-scoring years in case luck is not on your side in the first three.
I am leaning to the latter option with two extra dominant years, and the current season made the choice easier by making the tail ends a wash.