So this leaves you with 3 true top 4 guys (Larsson, Klefbom, Nurse), 1 guy that can pull spot duty there, but is ideally on the 3rd pairing (Russell); 3 or 4 3rd pairing guys (Benning, Gravel, Jarabek, Garrison), and 3/4 pospects knocking at the door (Bear, Jones, Bouchard, and Lagesson).
Feels a lot like 16/17 (you could say last year, but this group is deeper), where you can look to 8 guys can step up and carry the load. The issue is there is zero margin for injury or sloppy play from the main guys is zero. Sekera's injury really puts the team in an unconfortable spot.
The good new is you're down to needing 1 good body to round out the defence. Even a guy like Myers would have it looking good. Not saying he's avalible, but moreso that tier of player for example...
Klefbom-Larsson
Nurse-Myers
Russell-Jarabek
In short they don't need a massive name, they just need someone competent.