I will say I don’t entirely subscribe to the idea this drop in defensive play is the result of significantly less capable defensive players in our roster construction.
This team is largely unchanged from the beginning of last year
Bunting who stinks defensively was replaced with Bertuzzi who stinks defensively. No net difference.
Kerfoot out is unfortunate, he was useful defensively. Domi is a clear defensive downgrade, but actually contributes offense.
ROR, Lafferty, Acciari were added at the deadline and we were good defensively before they arrived.
Klingberg was a misstep but one that rectified itself so no longer an excuse.
We let Holl go and his role is now filled by McCabe. Holl was a good penalty killer but lousy in most other facets.
I’d say Brodie not playing his best is a bigger factor than any of the personnel choices given how important he’s been to our defensive game.
Bunting = Knies
Domi, Bert, McMann/Reaves are pretty big drops from Kerf, Engvall, ZAR. We saw more Holmberg last time at this point who was also better than the above in his own zone, but at a large offensive cost compared to Domi. This all changes how we deploy lines. You had the bottom 6 getting defensive starts, our top 6 getting offensive. Now it's more balanced and we're protecting some of those bottom 6. Sadly they haven't produced much offensively though and a lot of or depth is scoring at the rate of the guys they replaced while being much weaker defensively.
On D we've swapped Holl, Sandin for McCabe and an AHLer (Laggeson, Benoit). We're shallower overall and have to rely on the depth more, sooner. Last year we lost Muzzin in the first 5 games, Sandin/Lilj were 6 & 7.
Goaltending is worse at this point, Murray was a .925 goalie at this point last year and Sammy was .920, both approx splitting games.
Add in the drop off for Kampf and Brodie, you can see personnel is an issue defensively. They made some choices on it and we're seeing the results. It's not all bad, Domi's been good IMO and I don't mind Gregor at all, but some pretty easy swaps would make us a more more rounded team. Laff for Reaves has been done to death, but it's an obvious upgrade in every way but heavyweight fights. Kling for OEL, Dumba would improve us outright given the injury, but even in the small sample Kling was borderline unplayable and slotted behind Dumba last year on Minny.