Florida did the opposite but they targeted the perfect players all at the right age.
Tkachuk 25, Bennett 24, Reinhart 26, Verhaeghe 25, Forsling 24
They added these guys to a drafted Barkov and Ekblad with a signed #1 in Bob
Bruins have something similar in Pasta, McAvoy and Swayman they just need to target that 25 and under group and shoot big on someone like Elias Pettersson, JJ Peterka, McTavish
Then the other area of guys who have fallen out of favor like Nick Robertson, Jack Quinn, Mavrik Borque.
They can still look around free agency just like the Panthers did with getting Mikola, E-Rod, Kulikov but they didn't overpay and brought them into a system that fits their game (think Luke Kunin, Jeannot, that ilk)
I don't really think the method is that complicated it just comes down to targeting the right players.
Trading a boatload for an often injured 28 year old Barzal is not the same and Pageau is even farther from that.
I count seven players from your mentioned list, we have 3 right now and you missed Seth Jones, who IMO was huge for the Panthers in the playoffs.
How do we get the other 4 players with the cap space we have?
This is a challenge we have along with all the NHL teams, how to balance the cap and keep talent?
You need a solid mix of draft picks and players making 1M year, a great goalie, at least 2 stud defencemen and three balanced offensive lines.
And a legit number one center which we do not have and is so hard to get.
Our issue is and always has been for the last 10 years is scoring goals. We need forwards that shoot and can put the puck in the net.
We had the third lowest goals for total last year.
Two players Geekie and Pasty scored more than 20 goals last year.
Hopefully DS addresses this with trades / draft picks and UFA signing this year.
Acquiring Barzal only makes sense to me if Casey is heading the other way along with another crappy contract like HL.
A trade like Barzal and Dobson for CM,HL and our first round pick this year would make a great deal of sense to me.
Our team is immediately better and we still have cap space to plug holes.
The best two players in this trade are coming to the Bruins.