He did have a great year in 1982, yes. 39 goals is just insane. That's going to get a lot of deserved miles no matter what.
So what are we missing here? I agree with you, Langway's Norrises are always a good discussion and there are layers to this whole thing. If this happens in the 1940s and 1950s then you have a "Well, we had to be there at the time to notice" type of approach. But in the 1980s a lot of people were fans then. I guess for me one thing you can look at is that the Flyers were still not bad in 1982 before Howe. They had 87 points, were 7 games above .500. They did get better in 1983 with 106 but again, weren't bad prior to without Howe. Even in 1981 they had 97 points. Not so with Washington. They had 65 points in 1982, then the trade with Langway and they bump up to 94. The year after it was 101. This was the same franchise with arguable the worst season ever in 1975. They also never made the playoffs up until 1983 when Langway arrived. It was a good narrative and he did get a lot of credit for it.
But looking at the competition the one that does bother me the most is Howe in there. Bourque as well, but he did play in just 65 games. Maybe that factors in. Bourque in 1983 was good all around, but was he quite at the defensive level he would reach? I don't know. Howe pretty much played a full season though. Coffey had 96 points, but wasn't strong on the defensive end - at least not in the regular season - back then. Potvin missed 15 games or so. So I am thinking the idea that his team went bad to good was the winning narrative here.
Then in 1984, this one has a lot more unanswered questions. Coffey, Bourque and Potvin all had huge years. Langway had his usual defensive year with 33 points. Coffey racked up 126 points, 40 goals and +52. Bourque had 96 points, +51. Potvin had 85 points and +54. My goodness those are some huge numbers. Maybe the best season for a crop of defensemen in NHL history. And yet Langway wins it. You outscore the other guy by almost 100 points, you finish 2nd in scoring, and yet the guy with the wicked defense wins. Potvin was strong defensively, Bourque was strong defensively. Both were on good teams that did well because of them. I don't see it.
I can see you don't like poor Rob Blake!
There was a goal where he laid a perfect hip check, his specialty, in the 2002 Olympics. It was against Germany, but you could argue that it took him out of position and led to the Germans' 1st goal of the game, which sort of got them back into things at 3-1.
Start at 8:15
I mean, just a lovely check, a thing of beauty and a thunderous check too. Totally knocks the guy out of position and down on the ground. I don't know if Blake sort of admires the hit, but he doesn't fall into the position he should be in at that time and the Germans end up scoring. So this might be an example of what you are talking about. Not everyone can perfect the thunderous hit like Scott Stevens though, where you hit the guy into next week and still remain in good position. Brendan Shanahan once said that Blake can somehow manage to throw you a hip check where his rear will end up in your chest. I think his hits generally had some value to them though.