I'm all for being bullish on the team, but when really have no plan for a 2C after this season, you don't have a cup winning core. They still have to figure out what they're doing at the center position long term. And as much as I want Chytil to be that guy, he has yet to prove he is.
It's a major issue right now unless Strome takes a huge discount.
I think Kakko and Laf are also important to the franchise, but am willing to be quite a bit more patient with them since the winger position is less important to a team's success, and we can afford another year for them to ripen.
Overall, I like the shape of the team. But you can't really say you have a cup winning core of players without the centers to back it up.
They have some high end wingers locked down - the potential for two more on the way - and a core of 4 defensemen, maybe even more than that if their prospects do well, and 4 years of a potential vezina candidate at this rate.
But without a good 2C, that's really not enough to win.