I've also noted a strengthening of the league using a
couple of
different methods. The quality of a "typical 2nd-place scorer" has improved at a rate of roughly 5% per century. As such, if you're looking at a a VsX score from 50 years ago, it's probably ~2.5% higher than it should be compared with a modern-day VsX score. Whether that makes any real difference is up to the reader to decide.
From 1949/50 to 1974/75, the 2nd place scorer was, on average,
12.5% behind 1st.
From 1989/90 to 2019/20, the 2nd place scorer was, on, average,
8.5% behind 1st.
So pretty close to what you have come up with. IMO, it's enough of a difference to give a marginal edge over another, in a strictly a statistical discussion.
Using VsX (#2 scorer) for Belliveau, Crosby and Hull, the numbers do not change much vs. a VsX (#1 scorer).
In their 12 best point finishes
Crosby was, on average,
6% behind 2nd place (best was 20%
ahead, and worst was 21% behind)
Hull was, on average,
8.5% behind 12nd place (best was 24%
ahead, and worst was 31% behind)
Beliveau, was, on average,
10% behind 2nd place (best was 11%
ahead, and worst was 36% behind)
In their 11 best PPG finishes*
Crosby was, on average,
5.5% ahead of 2nd place (best was 27%
ahead, and worst was 3% behind)**
Hull was, on average,
4.5% behind 12nd place (best was 30%
ahead, and worst was 23% behind)
Beliveau, was, on average,
2.5% behind 2nd place (best was 11%
ahead, and worst was 21% behind)
* Hull's 12th best was 45%, a statistical anomaly, IMO.
** assumed a tie in PPG with Malkin in 11/12, too many missed games