I understand what you are trying to say. However, I don't think you are assessing the characteristics of players fairly based on preconceived conclusions about the necessity and/or long-term impact of the acquisitions. The team has improved as it has gotten tougher and older.
Kakko and Chytil, despite their size, are not gritty. I don't think Chytil has a hit all year and has lost almost every down low battle he has accidentally found himself in. Laf isn't either at the moment since he doesn't have enough of an effect on the game one way or another, but he has potential. Z, on the other hand, is a skilled and gritty player. Motte is not just speed, he is a gritty player. Vatrano is also a gritty player, plays in tight and has a great shot. "Tough" players aren't just fighters like Reaves. They are players willing to go to the hard areas of the ice; Half wall, corners, net front; and play the game there, engage, and win. We had little of that all year cause even with the addition of tougher players in the offseason, we still didn't have enough of them at the NHL level and we were still simply too young.
Our team had injuries and their lack of depth brought in AHL players to fill those holes. That doesn't mean the team brought in a bunch of gritty players. AHLer does not automatically equal gritty player. They simply were not NHL level players.
Copp is a player that can do both, and if this team really needed more skill then grit, why is it a unanimous decision among all Ranger fans that Copp, the gritty player, should be kept over Strome, the non-gritty player? Strome has out produced Copp every year. And not just as a Ranger, literally every year they have both been in the league. Surely he is the keeper right? Well, of course, we know that isn't the case, cause we don't need skill only, we need grit.
Looking back at the Cup winners since 2010, there is no team that won with more skill players and less grit. The majority of the lineups are tough, capable NHLers. That is what we added. There are even 3 to 4 teams you can argue that didn't have a skill-only player in the lineup that would be akin to like a Panarin. Now this ins't irrefutable evidence, but look at Calgary and Minnesota. They are the 2 teams that flat out beat us the worst all season and they are a mixture of skill and toughness that fairs well in the playoffs when scoring goes down, the game is played tighter and more often in the corners and net front.
Everyone wants a young, talented, cost controlled, center, but the reality is that that player is not available without issues or question marks, usually. Right now, there are none that look to be shaking loose. That will likely not change until next season since all the young, under-performing teams look to be comfortable with their young centers. Currently, no drama around the league so to speak. Lundell is not available.