Sure, over-achieving is something I think most would agree with, especially since most had the Rangers as a borderline playoff team. But this isn't Montreal last year. This is a team that was expected to be excellent soon, just not yet. For all the "unsustainable" folks: that's fine. The beauty of this season's success so far is that it doesn't have to be sustainable. This is a bonus, not the expectation.
As for the promise of the 2nd window, you may be correct. But I've watched enough hockey over decades to know better than to write off or bet on anyone not truly generational like Lemieux, Jagr, McDavid, Crosby, and Ovechkin at the age of 20-22, especially not in the weirdest seasons the NHL has seen since WW2, and kids having played under 100 games. They may not deliver. They may. Either way, it's okay, but we should enjoy the damn ride at least. Of the 32 teams in the league, 31 won't win the Cup every year. But hovering at 70% points percentage through nearly half a year is a very good sign.