I'll admit that was a massive failing on the part of Bednar to do the conventional "coachthink" thing and stick with two objectively awful players on his blueline. He had to know they got killed every single time they took the ice but he refused to use two players who were available who might have done a degree or two better.
I think Bednar's fatal flaw is his surprisingly stodgy view of the penalty kill. It clouds his judgment on literally everything else. He is insistent on a very passive shot-blocking system when everything else he does is about speed and aggressive play. He goes out of his way to use his worst defensemen on it even though it's at its most effective when the very best ones are on it, because they can secure the puck and clear it. And worst of all he's convinced that if his defensemen aren't familiar with this supposedly complicated PK system, he can't take the guys who supposedly are out of the lineup. Like...what is so complicated? You cover the lower half of the ice and the net-front area. The forwards have that thing where they rotate around and skate in an arc to block passing lanes and what not, but the defensemen don't do anything special in this ridiculously conservative PK system. So I don't get why you can't just throw a player who may not have logged as much time on it and get them up to speed. Just very, very frustrating as I've always praised Bednar for making the bolder, less conventional choice when it came to his lineups and his approach. But going with the "safe" option here was a major factor toward the team's third straight exit in the second round. And while I think he unabashedly deserves to return for another season, this seriously makes me wonder if he's the guy who's gonna take the team the rest of the way.
I've said it repeatedly, Ryan Graves was actually a LOT better killing penalties when he first started with the Avs, he became demonstrably worse when they coached him up, told him not to play aggressively in the corners, and block shots, which he's terrible at doing. So don't tell me it takes a ton of practice time to familiarize a defenseman with this PK system.
Maybe later I'll say all the nice things about him and how much good he's done with this team. But right now I'm still very sad and somewhat frustrated with him.