Known stars
Seider
Raymond
Edvinsson
Still a bit early on Edvinsson but I think he's shown enough at his age, including in the NHL now, to project him as a special player. We would have been happy with him finding his footing and taking a 2nd pair spot by mid-season, we're a quarter of the way in and he's proven he can hold his own on a top pair. And finally another high quality D for Seider to play with. I don't think there'll be any debate about his placement here by season's end.
Very strong chance of becoming stars
ASP
Cossa
Good chance of being a valuable NHL player, possible more
Kasper
Danielson
MBN
Augustine
Plus there's about another half dozen to a dozen players who could become something as well, like Berggren, Buchelnikov, Wallinder, Plante, etc etc. And there are other players who still have a lot of good hockey years in them like Larkin and Debrincat.
To call this rebuild a failure is so extremely premature, especially when you consider that half of the fruits of this rebuild aren't even on the team yet. And doubly so since several of those fruits are absolutely killing it in lower leagues.