Your stats are wrong Sekera and Russell had the lowest goals against per 60 on the team by a good margin. Nurse had the worst so I have no idea where your info is coming from.
Player Season Totals - Natural Stat Trick
Ignored shot quality? The point of his article is that shot quality is future. The biggest problem with shot attempts is that it ignores shot quality.
His article brings up nothing about shot quality analysis, the only thing he analyzes are goals (and even concedes in the conclusion section that shot quality needs to be addressed. Also you do realize there's plenty of analytics out there that talk about shot quality right, the most simple being xGF and xGA (expected goals for and against adjusted based on proximity/angle of shots etc), which Kris Russell performs miserably for (2nd last among defensemen for expected goals against, dead last on the team for expected goal differential among players who have played over 20 games).
You keep moving the goalpost when you've been proven factually wrong. You've been saying "lowest goals against" all thread long and now you change it to "lowest goals against per 60". And according to Corsisca, Benning and Nurse had lower goals against last season. Per 60 stats are also incredibly flawed due to it not taking into account quality of competition, quality of teammates, and goaltender performance. If you go with goals against per 60, you have Oscar Klefbom and Adam Larsson being worse defensively than Eric Gryba. Goals against per 60 in 20162-17 also says the following:
-Brandon Mountour is better than Hampus Lindholm and Josh Manson
-Brandon Carlo and Zdeno Chara are the worst defensive players on the Boston Bruins, by far
-Ryan Murphy is better than Noah Hanifin
-Gustav Forsling, TVR, and Michal Roszival are all better than Niklas Hjarlmasson
-Matt Greene, Kevin Gravel, and Brayden McNabb are all better than Drew Doughty
-Christian Folin is better than Ryan Suter
-Matt Irwin is the best defensive dman on the Predators, by far
-Brendan Smith is better than Ryan McDonagh
-Frederik Claessen, Chris Wideman, and Matt Borowiecki are the best defensive players on the Senators, each better than the next by a significant margin and waaaaay better than Marc Methot
-Marc Edouard Vlasic and Paul Martin are the worst defensive players on San Jose
-Robert Bortuzzo is by far the best defensive player in St Louis, almost twice as good as Alex Pietrangelo
-Jake Dotchin, Luke Witkowski, and Braydon Coburn are all better than Victor Hedman and Anton Stralman
-Roman Polak is the best defensive player on Toronto
The only thing it does right is that it consistently correctly identifies Erik Gudbranson as one of the worst defensive dmen in the league on a yearly basis, but pretty much any stat would show that anyway. I think we can safely put the "goals against per 60 stat" in the pile labelled "this stat is never useful, if you cite it you don't know what you're talking about".