Actually, it's not a bell curve, it's the end of the long tail of an unknown distribution (which could be a Bell Curve, but who knows?).
So McDavid is way out there in his own tier, then the second tier has a handful or two, the third tier a couple dozen, the fourth tier maybe 50 and so on.
When I look at scoring, I look at the median "line" player, but that obscures how scoring is actually distributed.
So 1st line median is #48, 2nd line, #144, 3rd line, #240.
When you look at actual pp/60 (5x5):
#48: 2.26, #144: 1.69, #240: 1.17
3.00+ - McKinnon, Skinner, Tkachuk, Pastrnak, Thompson, Pettersson
2.80-2.99: McCann, Point, Tuch, Kuzmenko, Roberson, Hughes
2.60-2.79: Marner, Hintz, Verhaeghe, Matthews, McDavid, Benn, Crosby, Nylander
2.40-2.59: 16
2.20-2.39: 25
2.00-2.19: 28
1.80-1.99: 35
1.60-1.79: 32
1.40-1.59: 50
1.20-1.39: 29 [800 minute minimum probably causes players to drop out at this point]
[this is not a ranking of players, just a crude attempt to get a picture of the distribution of scoring]
3 year distribution [2000 minutes]:
#48: 2.23, #144: 1.75, #240: 1.18
3.00+ - Marner, Matthews, McKinnon
2.80-2.99: McDavid, Tkachuk, Robertson
2.60-2.79: Pastrnak, Marchand, Verhaeghe, Kaprizov, Panarin, Fiala, JG
2.40-2.59: 17
2.20-2.39: 23 [Farabee 2.21, #53]
2.00-2.19: 33 [TK 2.19 #54, Giroux 2.10 #70]
1.80-1.99: 44
1.60-1.79: 47 [Hayes 1.79 #132, JVR 1.76 #138, Tippett 1.69 #157]
1.40-1.59: 43 [Cousins 1.59, #178, Laughton 1.41, #217]
Deslauriers 0.86, #255
1.40 or so seems to be the cutoff to have a secure, top 9 spot.