Championship*
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And since when do we have this core with Stepan, Staal, McDonagh, Del Zotto, Callahan, Girardi, Lundqvist? Three years, more or less. Since then our last rebuild (even though it wasn't done the Penguins way) is finished. Since then we have done some minor retooling and one major retooling (Bash trade). This core still has quite a few years left and until then you try it with them. You do not blow everything up after just two or three years of trying, you blow it up when your core players are at the very end of their prime. Otherwise you'd be rebuilding like 70% of the time, which is just stupid.
And some of you really have wrong expectations of a rebuild. Only a few rebuilds lead to a serious contender. Even Pittsburgh, with their double jackpot of Malkin and Crosby has made it to the ECF just twice until now. Even four top-2 picks in a row with two generational talents is not guarantee for success. And Pittsburgh obviously is one of the better examples for a rebuild. Edmonton has sucked for years now and shows little improvement. But it even gets worse: There's no guarantee for continous top 3 picks either, even if you tank. Then this team could be the new Florida Panthers.
When have we had that core? For the last few years. You are aware of that right? You answered your own question. Last Rebuild? The Rangers have never done a true rebuild. The retooling isn't working.