I know but it's the way Leafs fans are bragging all over the internet... IMO, if you look at the modern history of their team, they have nothing to brag about. I would stay quiet in their place. You also can't brag "in advance", doesn't make sense.
And even now, Leafs are over hyped, which is often the case with big markets. For all the hype going into this season, they are projected to finish with the same number of points as last year. They are currently 14th in P%, which is right in the middle, there's plenty of teams doing better.
The trend? So what is the trend? Sens had trends like that before too and then they regressed. Panthers and Jackets also had trends and then regressed, as many other teams. They have the extraordinary Matthews? I heard that this Karlsson guy wasn't too shabby either... They have "great young players" like Nylander and Marner? Sens had Stone, Hoffman, Zibanejad (so in fact Sens had more)... Kadri? Sens had Turris... Reilly? Sens had Ceci and now they have Chabot. Solid vets like JVR and Bozak? Sens had Ryan and MacArthur. A good N.1? Sens had Anderson in his prime. I really don't see how their actual talent is any better than what the Sens had since 2013. Of course in terms of hype and popularity, it's no match but that's it.
I'll give you that they have much better goaltending and coaching, just reverse the coaches and teams probably switch their spots in the standings. They also have not yet undergone devastating injuries like MacArthur, Ryan, Karlsson had. They also didn't lose a pillar like Methot in the expansion draft, no they lost Brendan Leipsic.
Next season, JVR, Bozak and Komarov are UFA and due for a decent to big raise. With Matthews, Nylander and Marner new contracts upcoming, I doubt they will be able to retain that veteran depth.
EDIT : Also, you were talking about "projection of their young roster"... who are you thinking of there? Outside of the "big 3"