Well let's not exaggerate here. In Naz's first season with the Avs he averaged 17:26 TOI. His following year when most people agree he sucked, he still averaged 16:28. That's not a massive drop. His final year in Colorado where he went balls out, his ATOI jumped to 19:14. So don't say that he *only* went with a viable 2C option when Kadri was playing his career best, because that's simply not true.
Also, Soderberg, not counting the year the Avs tanked for Cale, averaged a little over 17 minutes for two seasons under Bednar. He was always listed as the 3C but we all know he was the 2C both those years.
Mittelstadt when he first arrived in COL, averaged around 15+ minutes, and even getting exiled to what was essentially 4th line minutes near the end of his next (and final) season, it still averaged out to 17 minutes exactly.
I just don't agree with what your positing here. Bednar has had issues for sure, but he has not been behind the 2C issue--that's on management, 100000%.
One thing that is simply not being talked about enough is, not only is the team missing half of its scoring line wingers, the OTHER half are mired in a very, very worrisome slump. Neither Nichushkin nor Lehkonen have scored much, if any, at even strength for well over 10 games now. Lehkonen has GOT to be injured because he's making some gawdawful mistakes and taking really dumb penalties that just isn't characteristic of him. So now Bednar is trying just about everything he can to get those two going and nothing, not even a shootout winner, is working. On top of that there's clearly some sort of issue with Nathan MacKinnon that absolutely NO ONE is talking about.