It's not that our defense has gotten worse. It's the idea that our depth has suffered and as such, our top guys play more which makes them worse because they're more tired through the course of games.
Because we have to rely on top-heavy rosters rather than super deep rosters, we can't play the "overwhelm with pressure" style Bednar wants and we get hemmed in more now IMO than we have in the past. Thus, the goaltending needs to make up for the lack of depth and it just hasn't the last two seasons.