I think had we had Shesterkin in all year we would have cruised to a playoff spot. Adding Lafreniere, possibly Barron and with an already improved Kakko i don't see why not. Also, Smith and Trouba were good once Skjei left, Lindgren and Fox were good all year and the only iffy spot in the 3rd pair LD, add in Miller and Hajek from time to time and i think we should make playoffs providing Shesterkin is healthy. To add vap space at this point and possibly block Miller and Hajek from ice time isnt what i think we should be doing.
No pairing with Smith on it has been good in 3 years. Better than expected? A little, but Brendan Smith has a penchant for taking absolutely idiotic penalties at the worst possible times. I mean, he took two in the Carolina series alone (when tied 1-1 in both games two and three). He's not a guy you want playing top-4 minutes and he's especially not a guy you want consistently taking the matchups we expect Trouba to be handling. Edit: by the way, Smith seemed to have improved on that. Last year, when he spent most of the season at forward, he only had 13 minors, which was 10th most on the team. The year before, he had 23, which was the most on the team. The year before that, he had 22... in only 44 games... which also was the most on the team despite only being a half-season worth of games.
Our problem with those guys on the defense is going to be... well, defense. Lafrenière and an improved Kakko aren't really going to help us there. Not sure why you brought them up. Frankly, there's not really that much room for improvement in team offense. We were 5th last season and 0.14 goals per game behind 1st. What I'm expecting from those two guys is to help balance out Panarin and Zibanejad, since I don't think we should rely on them matching what were career years. Maybe they will, but having some more offensive tools means we don't need them to.
It's possible Hajek steps up. Or Reunanen. Or Miller. I'm not discounting that possibility. I think the best situation for their development is to allow whichever rookie is in the lineup a little shelter, though. You have the goal of helping those guys develop, and stay competitive. You're not going to be able to do that without another quality LD on the team.
And please, let's not rely too hard on goaltending. If we get a stellar performance from Shesterkin, then great, but we should be focusing on putting out a good team in front of him. I don't want us to go overboard in doing so, but it's something I think needs addressing.