He's already one of the best in the playoffs, but it's quite early to put him in the discussion for #5. If there was no McDavid, then he would have a decent chance at another couple of Rosses, but since there is and Kucherov is 28 with some history of injury, he's got his work cut out for him in that regard.
I was going to wait until playoffs were over, but I calculated some players' adjusted playoff points during their primes, using this method:
1968-2020 - Leading Playoff Scorers Adjusted to Opponent GA
| AGES | | YEARS | | | | |
PLAYER | Beg. | End | Beg. | End | GP | Adj. Pts. | APPG |
Gretzky | 20 | 28 | 1981 | 1989 | 128 | 182.3 | 1.42 |
Lemieux | 23 | 31 | 1989 | 1997 | 89 | 117.5 | 1.32 |
Lafleur | 23 | 28 | 1975 | 1980 | 72 | 87.6 | 1.22 |
Jagr | 23 | 36 | 1995 | 2008 | 106 | 123.3 | 1.16 |
Forsberg | 22 | 32 | 1996 | 2006 | 133 | 151.4 | 1.14 |
Kucherov | 21 | 27 | 2015 | 2021 | 109 | 121.4 | 1.11 |
Sakic | 26 | 36 | 1996 | 2006 | 150 | 163.8 | 1.09 |
Bo. Hull | 22 | 33 | 1961 | 1972 | 107 | 115.1 | 1.08 |
Crosby | 19 | 30 | 2007 | 2018 | 160 | 167.0 | 1.04 |
Malkin | 21 | 30 | 2008 | 2017 | 144 | 144.0 | 1.00 |
Kane | 20 | 27 | 2009 | 2016 | 123 | 120.2 | 0.98 |
Bossy | 23 | 28 | 1980 | 1985 | 103 | 98.9 | 0.96 |
Kurri | 20 | 27 | 1981 | 1988 | 117 | 112.2 | 0.96 |
Mikita | 20 | 33 | 1961 | 1974 | 134 | 126.0 | 0.94 |
Fedorov | 23 | 31 | 1993 | 2001 | 117 | 109.4 | 0.93 |
Messier | 22 | 34 | 1983 | 1995 | 193 | 179.2 | 0.93 |
Stastny | 24 | 35 | 1981 | 1992 | 84 | 77.5 | 0.92 |
Sundin | 24 | 38 | 1995 | 2009 | 85 | 77.9 | 0.92 |
Br. Hull | 25 | 35 | 1990 | 2000 | 127 | 115.9 | 0.91 |
Ovechkin | 22 | 33 | 2008 | 2019 | 128 | 115.7 | 0.90 |
Yzerman | 27 | 36 | 1993 | 2002 | 127 | 109.9 | 0.87 |
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One can see how this all but eliminates players like Mikita, Messier & Ovechkin from the #5 discussion. There's no adjustment for the expansion effect in the 70s, so Lafleur's PPG should probably be at least a few hundredths lower after some sort of adjustment. He also has the shortest prime in terms of both years and games played. I didn't calculate Esposito & Orr due to the expansion effect, and have yet to calculate players like Howe, Beliveau & Richard. For the latter players, they don't have nearly complete plus-minus data, which I'm including in the following table for the top ten ~half in the table above:
| AGES | | SEASONS | | | | | | | | | | |
PLAYER | Beg. | End | Beg. | End | GP | Adj. Pts. | APPG | | +/- | OFF | PM/GP | OFF/GP | Est. APM |
Gretzky | 20 | 28 | 1981 | 1989 | 128 | 182.3 | 1.42 | | +89 | +80.8 | 0.70 | 0.63 | 0.38 |
Lemieux | 23 | 31 | 1989 | 1997 | 89 | 117.5 | 1.32 | | +16 | +21.4 | 0.18 | 0.24 | 0.06 |
Lafleur | 23 | 28 | 1975 | 1980 | 72 | 87.6 | 1.22 | | +58 | +36.8 | 0.81 | 0.51 | 0.55 |
Jagr | 23 | 36 | 1995 | 2008 | 106 | 123.3 | 1.16 | | +32 | -47.6 | 0.30 | -0.45 | 0.53 |
Forsberg | 22 | 32 | 1996 | 2006 | 133 | 151.4 | 1.14 | | +47 | -13 | 0.35 | -0.10 | 0.40 |
Kucherov | 21 | 27 | 2015 | 2021 | 109 | 121.4 | 1.11 | | +31 | -2.4 | 0.28 | -0.02 | 0.30 |
Sakic | 26 | 36 | 1996 | 2006 | 150 | 163.8 | 1.09 | | +12 | +44 | 0.08 | 0.29 | -0.07 |
Bo. Hull | 22 | 33 | 1961 | 1972 | 107 | 115.1 | 1.08 | | +22 | -11.4 | 0.21 | -0.11 | 0.26 |
Crosby | 19 | 30 | 2007 | 2018 | 160 | 167.0 | 1.04 | | +21 | +17.6 | 0.13 | 0.11 | 0.08 |
Malkin | 21 | 30 | 2008 | 2017 | 144 | 144.0 | 1.00 | | +18 | +24 | 0.13 | 0.17 | 0.04 |
Kane | 20 | 27 | 2009 | 2016 | 123 | 120.2 | 0.98 | | +7 | +25.8 | 0.06 | 0.21 | -0.05 |
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Gretzky & Lafleur have by far the best plus-minus per game during their primes, but of course they played on by far the best teams (with their teams ~ +0.63 & +0.51 per game without them on the ice). After that, it's Forsberg, Jagr, Kucherov & Hull with the best plus-minus per game (ranging from +0.21 to 0.35 per game). Estimated adjusted plus-minus is just a ballpark calculation for comparison purposes:
OFF = [ Team PM - (ON * 5) ] / 5
Est. APM = ON - (OFF/2)
It's not adjusting for SH GF & GA, since we don't have that data, and it's assuming each listed player is on the ice for ~1/3 of ES scoring events. Just a rough calculation, but still useful.
Jagr was clearly on the worst teams by far (-0.45 per game at ES when he was off the ice, with Hull's teams the next worst at -0.11), yet aside from Gretzky & Lafleur (who were on teams that were around a full goal per game better than Jagr's teams without those players on the ice) he has about as good a plus-minus per game during playoff primes as anyone. So outside of the big 4, players like Jagr, Lafleur, Forsberg & Kucherov stand out as playoff beasts, both in terms of adjusted scoring and from plus-minus data.
Of those 4, Jagr & Lafleur were clearly the best peak scorers, and Jagr & Forsberg had the largest overall value at ES, according to adjusted plus-minus. On top of that, none of those other three have close to Jagr's longevity, as Jagr's prime lasted about as long as each of the others' careers. That's what puts him in such elite territory IMO, there is no other forward outside of the big 4 than can match him in all or even most of these important metrics (peak/prime/career: Scoring, ES effectiveness, playoff scoring, playoff ES effectiveness, etc.).
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Peak/Prime scoring: One could make arguments for Espo & Lafleur, but Orr's influence aside, they each played in an unbalanced league and without the competition from non-Canadian players. Mikita & Hull have the same issue with competition. I don't believe any of them were on Jagr's level, as Espo is the only one that appears to me to possibly be on the same level, and he has the most extraneous factors.
Career Scoring: I think this is pretty clear.
Peak/Prime Adjusted Plus-Minus: There are players like Forsberg & Lindros with similar, perhaps a bit better adjusted plus-minus per game during their peaks/primes, but of course we must keep in mind that they were nowhere as durable as Jagr, and so not only were missing many more games per season, but also missing entire seasons and had much shorter careers as a result of their physical play (which likely enabled them to have such excellent per-game ES performances).
Career Adjusted Plus-Minus: This is very clear, as the only person outside of the big 4 that's anywhere close is Bourque, who played many more minutes as a d-man.
Peak/Prime Playoff Scoring: There are the aforementioned players in his range, but nobody clearly above him, outside of the big 4.
Peak/Prime Playoff ES Data: Again, when considering the low quality of his teams, his ES data is remarkable and difficult to match, let alone surpass.
Career Playoffs: Playing a high % of playoff games outside his prime hurts his career averages, but we're still talking about a player that won two Cups, led the playoffs in ES goals & points at age 20 during one of those runs, was shown by another study (since WHA merger) to be among the most clutch playoff players, and has (at this time, at least) the most career playoff points of any non-Oiler. I'm not saying he clearly wins this category or anything, but it's not at all the weakness portrayed by many.