That still factors into things. Hell, there are people who still pine for Colin White after the Lehner deal.
Kulich's offensive game certainly popped more than Rosen. I would say that Rosen is a better player in his own zone right now by a large enough margin that it's something to consider. Neither are guys I see pushing into the NHL lineup to start the year right now, they're both still in need of further finishing. I'm hopeful that both are able to hit the gym hard all summer which is why if they aren't on the ice for Dev Camp, I wouldn't be sad. It feels like they need more time moving weight plates than trying not to get a groin pull in July.
Some may be out of sight, out of mind and it probably doesn't stop until/when someone in their prospect group is traded or they make a significant jump in their overall play.
As for the collection of Savoie, Ostlund, Kulich, Rosen, Quinn and Peterka, there is going to be debate on who is where and what role as well as who is likely moveable (either hurts least or garners most value). And yes, I'd consider putting Poltapov in that group though by role, it's possible he fits more in a high-energy, checking role (which can be said of Ostlund already and possibly Peterka and even Kulich).
What we can look at right now is that while Rosen's season was good, he's not ready and he's not going to command the attention like others do right now. And ultimately, it might be that Savoie is the one who is moved because of positional flexibility and possibility of being a game breaking offensive contributor may be their most valuable asset to make a considerable splash for the big club.