20-21 season everyone was hurt besides he and Faulk. Krug played 20 minutes on the pk that year and I doubt he will ever sniff close to that amount anytime soon. Last year he got hurt mid game and played like 7 minutes in one game and the other he got 26 penalty minutes and played 5 the entire game. If you accounted for that, you'd get around 19 minutes per game for Krug last year which isn't necessarily massive, but it's not as drastic as losing 2 min+ of ice time in a year. It's obvious that they see Krug is a liability, but until we see him playing like 16 minutes a night, I'm pumping the brakes. That's still top 4 minutes on this team. If after this year, he drops another 1:30 or 2:00, then I'll change my tune.
20-21 Krug and Faulk were the only healthy defenseman so it doesn't surprise me he had 22 minutes. 22-23, as a mention above, he had two games where he played less than 8 minutes which accounts for roughly 30 seconds over the course of the season, so in reality he should've played 19 minutes as opposed to 18:30. As I also mention above, 18 min on this team is still top 4, so I don't foresee his ice time changing drastically this year unless he is actually awful. Even strength is a different question and I'd have to see how he's deployed to really make an accurate reading on what's happening.
All this to say that of the mentioned strategies people have outlined, Armstrong is likely to do only one of them, and that's to trade him. And that rests on the available suitors willing to take Krug who have the cap space to do so. I guess Krug could be made uncomfortable, but in all of the interviews I've seen with Armstrong, he's very candid on how he handles situations with players when he's actively trading them, and I just don't see a scenario where Krug is made uncomfortable. Now, there are always surprise things that happen midseason and a team could really want Krug and he waives his no-move, but that's like the only thing that would get him off the team. Blues don't have the defenseman to push him aside at this point is the way I see it. But we can revisit this at the end of the season I guess?