Army's plan? That's a good question. Keep in mind, Mikkola is a little older than your typical rookie. He's played a couple years of pro in Finland and is 24 years old. So if you like the guy and think he's ready, it would seem like now's the time to have him on the roster full time. Gunnarsson turns 34 in November, has had some durability issues, and becomes a UFA after this season. So he could be gone after this year, freeing up a spot _ a lefty spot. As promising as Perunovich is, a year in the AHL might be good for him._ assuming there is an AHL this coming season.
Keep in mind, too, the Blues could very well lose a defenseman in the expansion draft next offseason. So maybe they're not as deep as you think on the left side _ after this coming season..
As for Dunn, that's a good question. I think he's held in higher regard around the league than he is in St. Louis. I mean, the guy was your fifth D-man last year. I actually think his defense and puck-clearing got noticeably better at the end of the regular season (pre-pandemic). Obviously, he didn't play well in the bubble (nor did Parayko) _ but both of them could have been recovering from COVID-19. (At least they are suspected of such.) And in case you're wondering, I asked Dunn on a Zoom call in the Edmonton bubble what kept him off the ice for two weeks and he declined to answer.