As I showed earlier in the thread, from 1980-81 through 1987-88, Gretzky scored at a pace of 56 goals per 80 games vs. the six top defensive clubs in the NHL. Overall during this same period, he scored at a 69-goal pace. So, it would be like this:
Gretzky '81 to '88 vs. top-six defence
56 goals per season
Gretzky '81 to '88 vs. rest of defence
73 goals per season
So, in this roughly peak-period, Gretzky's
goal scoring (not his point production, btw) dropped by about 23%.
So, ignoring Bossy's stellar numbers here for a moment, Gretzky's goals results here are remarkably good: averaging 56 goals per season vs. the top defensive clubs for eight straight seasons is amazing. And, again, the top-six thing is just one I arbitrarily chose as it is slightly more than 1/4 of the League at the time. But let's change it up a bit, and do the top 2 clubs, which were Montreal and Philly. Gretzky scored 40 goals in 47 games against them, or a 68-goal pace -- i.e., exactly the same as his overall pace during this period. (Bossy, btw, scored at a 59-goal pace, well
below Gretzky's, against these top-two defensive teams during his eight-year prime.) So, a lot of these opponent-focused things are kind of arbitrary.
Anyway, back to the top-six defensive opponents, since I set that standard. I'm wondering how Gretzky's 23% drop in goals compares to other top goal scorers? So, let's compare his results to (three players that come to mind) Michel Goulet, Steve Yzerman, and Mario Lemieux:
Goulet '81 to '88 overall:
51 goals per 80 games
Goulet '81 to '88 vs. top-six defence:
52-53 goals per 80 games
Goulet '81 to '88 vs. rest of defence:
51 goals per 80 games
So, Goulet scored goals at exactly the same rate vs. top defensive clubs (choosing, again, the top
six somewhat arbitrarily) as against bottom fifteen. Full marks to Goulet!
Yzerman '87 to '94 overall:
51 goals per 80 games
Yzerman '87 to '94 vs. top-six defence:
45 goals per 80 games
Yzerman '87 to '94 vs. rest of defence:
53 goals per 80 games
So, Yzerman had a a 15% drop vs. top defense.
Lemieux '88 to '96 overall:
74 goals per 80 games
Lemieux '88 to '96 vs. top-six defence:
70 goals per 80 games
Lemieux '88 to '96 vs. rest of defence:
75 goals per 80 games
So, Mario had a 7% drop vs. top defense.
Now, these are just three players for comparison, but it's interesting to me that the wingers (Bossy and Goulet) have the least drop-off in goal production vs. top-six defences, while the centers have more. Would there be a consistent trend in hockey where centers generally score less of their goals vs. tougher defenses, while wingers continue to produce at comparable rates? (One would have to engage in far more studies than I have time to in order to find out.)
Anyway, back to Gretzky: We can see that his 23% fall off from top defences to 'rest of the League' is a bit higher than Yzerman's and certainly higher than Lemieux's. So, for whatever reasons, Gretzky was scoring
less goals than his own standards against those top-six clubs. At the same time, however, he was also scoring
more goals than (in this fairly random comparison) Yzerman and Goulet were, overall, vs. top defenses. I mean, a 56-goal average against top-six defences is incredible, and a 68-goal average against top-
two defences is amazing. (Lemieux, btw, scored at either a 54 or a 71-goal pace vs. top-two defences, depending on whether you want to count Florida, whom he faced only five times, or Washington, whom he totally owned. Lemieux easily comes out on top among these players in pace vs. top-six defences overall, but that's not surprising as I think he has the strongest case for best goal-scorer ever.)
Then, it should be noted, as I think
@ContrarianGoaltender showed us, that Bossy's goals-pace vs. top clubs did not falter at all, and perhaps even was better in some cases. (But the same can be said of Michel Goulet!) Bossy deserves huge credit for this, of course.
Finally,
@authentic also make a point that Gretzky scored less "against higher stake opponents". Again, I'm not sure what he's basing this on. Seemingly not on playoffs? Gretzky had no trouble scoring goals against Montreal in '81, Philly in '85 (seven in a five games series), Calgary in '86, or Boston in '88 when the stakes were highest. Likewise, later vs. Van and Toronto in '93, and even with NYR in '97.
So, what's my conclusion in all this? It seems evident (at least based on these peak years of Gretzky's goal scoring) that he did score notably fewer goals against lesser defences (ignoring the top-two defences, against whom he excelled, which kind of skews the whole theory). However, he still scored a 56-goal pace against all six, which is steller to say the least.
Thus, it probably is fair to say -- at least goals-wise -- that Gretzky benefitted, in his prime years, from playing more games against lesser defences in the Smythe division and so on. (On the other hand, how much does team success play in this? The Oilers often had their worst results against Philly, Boston, and Washington in the 80s, and only played them three times a year, way out of time zone and often at the end of long road trips.)
Anyway, I think it is fair to say that Bossy scored at a bit higher pace than Gretzky (regular season, anyway) against the top defences (pace of 1 more goal every ten games played), but it is very incorrect to say that Gretzky didn't score at elite paces vs. those clubs, as he scored goals against top defences at a higher pace than Goulet and Yzerman and he owned clubs like Philly in the 80s.
Anyway, I've probably said enough in this thread. I'm all for praising Bossy, whom I think isn't getting enough respect lately. But these sorts of "goals in isolation" comparisons are really not on somehow when we're talking about playmaking centers (that includes Yzerman and Lemieux, if to slightly lesser degrees) compared to designated shooter-wingers (like Bossy, Goulet, Hull, etc.). But it is always an interesting topic!