Well I think Malkin and Ovechkin at their peak would be pretty close to matching them. I don't see any major difference in the level of play having watched them all. I think there are some pretty serious flaws with the way you're adjusting. If 100 is only equivalent to 111 doing it that way, then you have McDavid's 16/17, Kane's 15/16 and Crosby's 13/14 at the same level, actually a little below, Gaudreau and Huberdeau in 21/22. Even Robertson's 21/22 season would be pretty close. I have a hard time buying that. It seems to be more like a 20 point jump imo. I think there are factors at play that the adjustments aren't accounting for. Even still, Malkin's 11/12 comes out to around 135-140 using that way of adjusting. When it's that close I have a hard time putting anyone clearly above the other when the difference is that small.
For the record, this isn't me holding that era up as better than previous or future eras. Quite the opposite. What I've seen following hockey, football, soccer and basketball is that that outside of a few very rare outliers, the top end elite players are usually fairly consistently around the same level from one era to the next.
There are the very rare outliers like Gretzky/Lemieux, Jordan, Pele but even then there is usually another that comes along such as LeBron or Messi who can at least make it into the conversation. I think McDavid is making a pretty strong case for making it into that outlier group, but he is the only one.
I very quickly did base league goals per game for the blocks of seven years for an easy comparison. I wasn’t trying to account for everything (like even strength, power play and shorthanded separately as I normally do). I agree with most of your post though. Here are the best seasons of the salary cap era adjusted to the cap 19 year average.
2006 to 2024 (Salary cap era) League averages:
EVG: 2.11, PPG: 0.66, SHG: 0.09
Best seasons adjusted to the average:
‘21 McDavid:
56 GP: 34 G, 73 A, 107 P (1.91)
‘23 McDavid:
82 GP: 60 G, 86 A, 146 P (1.78)
‘24 Kucherov:
76 GP: 40 G, 88 A, 128 P (1.68)
‘24 McDavid:
74 GP: 29 G, 94 A, 123 P (1.66)
*‘11 Crosby:
41 GP: 33 G, 35 A, 68 P (1.66)
‘24 MacKinnon:
78 GP: 44 G, 81 A, 125 P (1.60)
‘12 Malkin:
75 GP: 54 G, 65 A, 119 P (1.59)
‘10 Ovechkin:
72 GP: 52 G, 60 A, 112 P (1.56)
‘19 Kucherov:
82 GP: 41 G, 87 A, 128 P (1.56)
‘20 Draisaitl:
71 GP: 43 G, 67 A, 110 P (1.55)
‘23 Draisaitl:
80 GP: 51 G, 73 A, 124 P (1.55)
These results respect your intuition that OV and Malkin are as good as MacKinnon this year and close to Kucherov (same with Sid) with McDavid being the outlier on another level entirely.
The best versions (in my opinion) of Gretzky and Lemieux adjusted to this cap average are as follows. They obviously would still be the 1 and 2 in any era
‘84 Gretzky:
74 GP: 62 G, 86 A, 148 P (2.00)
‘89 Lemieux:
76 GP: 61 G, 84 A, 145 P (1.91)