You do not build the core though trades or FAs.
All our core players were the players we drafted.
Yzerman, Fedorov, Lidstrom, Datsyuk, Z, konstatinov, osgood, Franzen.
Did I forget anyone?
You mean PP points not playoff points, right?
Dallas brought in a core piece in Tyler Seguin via trade. Their core right now is Benn-Seguin-Spezza-Klingberg, two of the four brought in via trade. Minnesota's core for the most part were brought in via signing/trade, and they're fairly legit. Your core is generally 2-3 players or so, and a lot of them are indeed brought in via trade/signing.
Anaheim - Kesler is a core piece right now I suppose but more high end complimentary
Arizona - All system
Boston - Rask was a trade but developed there
Buffalo - Ryan O'Reilly via trade
Calgary - All system
Carolina - All system
Colorado - All system, Johnson a high end complimentary piece IMO
Columbus - Aquired Sergei Bobrovsky and Seth Jones
Dallas - Tyler Seguin via trade, Spezza might be a high end complimentary piece
Detroit - High end complimentary pieces Nielsen/Green
Edmonton - All system IMO. Larsson is not a core piece
Florida - All system, brought in big complientary pieces
Los Angeles - Jeff Carter via trade
Minnesota - Zach Parise/Ryan Suter via signings, Dubynk via trade
Montreal - Shea Weber via trade, to be fair, had Subban who is similar
Nashville - Same as above with Johansen/Subban in their roles trading the same, Forsberg via trade though
New Jersey - Taylor Hall via trade, Corey Schneider via trade (great trades)
Islanders - All system, core kind of sucks (Tavares/Strome/Hamonic?) Was Frans too
Rangers - Eh, McDonagh but a big part of development was NYR, Rick Nash was, along with top complimentary pieces via FA (Hayes/Vesey)
Ottawa - Kyle Turris via trade,
Philadelphia - Jakub Voracek via trade, Wayne Simmonds via trade, highend compliemntary pieces in Couturier/Schenn (traded 2 core pieces)
Pittsburgh - Depends on your view on Kessel, that via trade
St. Louis - Shattenkirk via trade, Steen via trade
San Jose - Burns via trade, Thornton via trade,
Tampa Bay - All developed actually.
Toronto - All developed
Washington - All developed
Winnipeg - Aquired Wheeler/Buff/
You can sign/aquire core pieces. That is very difficult. A lot of the time you're trading potential or for sure core pieces. It's not easy to do so. Some massive trades where spare pieces got you a core piece for now and moving forward are Dallas with Seguin, San Jose with both trades for Burns and Thornton, spare parts Winnipeg did for their guys, and that Turris deal is a steal, though weak core besides Karlsson. Signing some players is super, super hard. Mike Green might actually be Detroit's most valuable player.
Chicago managed to sign a core piece in Marian Hossa though his decline is happening and he's a complimentary piece. Nashville traded two for two but managed to aquire Forsberg for like nothing. Looking at each team, some have a core of like 2 players, others like 5. It's interesting. Winnipeg has Laine/Ehlers/Wheeler/Buff/Schiefele top side pieces in Little/Trouba, with Trouba going either way I suppose. They're going to be ****ing dominant soon.