"He's got a great shot, he's a big man, he can move fairly well, and he can move the puck. He can kind of do a little bit of everything." Armstrong said.
"Whenever you get a defenseman, if they can create some form of offense, anywhere from 3-to-5 goals, and everybody chips in, that can change the way that you look as a team, and we liked his offense from the backside."
The 26-year-old Mackey, meanwhile, recorded two goals and one assist in 10 games with the Calgary Flames this season, following up a solid campaign with the AHL's Stockton Heat last year, notching 36 points in 53 games.
In terms of draft capital, the 2023 deadline yielded a king's ransom for Armstrong, who added one first-rounder (2023), two second-rounders (2024, 2026), three third-rounders (2023, 2025, 2026), one fifth-rounder (2023), and one sixth-rounder (2023).
The Coyotes have 37 total combined picks in the 2023, 2024, and 2025 NHL drafts.
"We had a plan going in," Armstrong said. "Obviously when you're in this process, you're trying to move bodies and create assets. I thought we did extremely well, and executed our plan … Not too many times can you go through a deadline and add eight draft picks and two good prospects. It was a big couple days for us."
Of course, those additions came at cost, as
the Coyotes bid farewell
to defensemen Jakob Chychrun, Shayne Gostisbehere, Troy Stecher, and Dysin Mayo, along with forwards Nick Bjugstad and Nick Ritchie.
Armstrong pointed out that the team is an extremely tight-knit group - so much so that they vacationed together during the 2023 All-Star break - but the return on investment was all part of the plan. Of the players who were traded, Gostisbehere, Stecher, Bjugstad, and Ritchie are set to be unrestricted free agents upon the season's conclusion.
Though Armstrong admitted the decision is never easy to move some of the team's leaders, he and his staff worked hard to keep everyone in the loop while discussions were ongoing.
"Our club was very, very close, and our guys were just unbelievable people. It hurts when you have to move them on, but they know the deal coming in," Armstrong said. We've tried to be very transparent and honest as we come up to the deadline with what we're thinking, and so they kind of expect it in some way. I think they're excited for the opportunity."