Your results differ from other approaches. I suspect part of this comes from your approach to comparing CHL point production to future NHL success
With these things in mind, let us repeat what we did with the forwards and look for the correlation between a player’s junior points in their first draft eligible season and their best season in the NHL.
The problem with this is that while junior point production by defensemen may not correlate strongly with NHL point totals it DOES correlate strongly with the players likelihood of having a successful NHL career.
From this article:
http://thats-offside.blogspot.ca/2013/06/defense-defensemen-and-draft.html
Defencemen picked in the rounds 1 – 3 of the NHL draft who fail to get at least 0.6 points per game have only ~10% chance of ever becoming regular NHL players. Defencemen who put up more than 0.6 points per game have a ~50% chance to someday become NHL regulars
but not necessarily point producers at the NHL level
You get a low correlation between CHL and NHL points because essentially all NHL defensemen who came from the CHL were high point producers in the CHL.
With that in mind you can also expand comparisons by normalizing to NHL league equivalent as is done here.
http://www.theprojectionproject.com
Looking for comparables that match each of Nurse’s Draft, Draft+1, Draft+2 years and within 2 inches of his height (6’2” – 6’6”) there are 15 comparables. Of those only 1 (Byfuglien) reached “elite” point totals in the NHL while 2 more (Brodie, Colaiacovo) slot in as 1st pair. Only 6 of the 15 became NHL regulars.
The sample size is large if you look for cumulative instead of matching each year but the percentages are nearly the same with 41 of 103 going on to be NHL regulars
First rounder’s do tend to have a better chance that later picks with similar numbers but I think it’s also worth considering WHY CHL point production has such a big impact on chances to make the NHL but not production once they get there. IMO it’s because you can’t play D at all in today’s NHL without a minimum level of skill and hockey IQ needed to move the puck out of the zone against NHL calibre forwards. These skills almost invariably lead to high point production in the CHL even if the player isn’t skilled enough to be a point producer at the NHL level.
Again IMO this is what’s going to limit Nurse. He can use his athletic ability to carry the puck but his reads and discussion making can be suspect. This works to great success for him in Junior but I think he will struggle with puck possession at the NHL level where he has less time to make reads and less space to carry the puck. As with all prospects we still need to wait and see.