Like many fans in this city, youre being way too optimistic on this team this soon. That fact that Dach and Slaf are already slumping is just how rebuilds go. Dach may be bust in the end. It happens.
Then youre talking about a D core thats being rebuilt from scratch. Right now, the Habs D is possibly the worst in the league, an absolute trainwreck. Hence they are VERY early in the rebuild. And Dmen development take a lonnnnnng time, some dont hit their peaks until their late 20s or even 30. Good news so far is Guhle and Hutson I think are absolute homeruns, to say they got them 16th and 64th is insane. Then again, Guhle may be an often injured dman as hes already shown.
Reinbacher and Mailloux, jury is still out. Unfortunately Reinbacher is back to square one, and that hurts the rebuild a lot! Mailloux great offesively in Laval, but needs to develop his defensive game tremendously if hes going to help this team in the longrun, as he did look awful defensively in his few games here. Hes going to take a while I think.
Just that alone, the amount of time this young D core will need, is what you should base your expectations on. You absolutely dont win the Cup with young Dmen in their early to mid 20s (unless youre Cale Makar). Its takes Dmen with a ton of experience, and hope the coach has a great defensive system going as well. Thats how the recent Cup winners like FLA, COL, and VGK won. Great coaching, a great defensive system, along with key elite pieces.