Here’s some footage of Mackey that I found in the 2017 Development Camp thread. Most poster scouting reports (including my own) were that he didn’t stand out good or bad, but with defensive defenceman this is often the case. He’s number 94.
https://youtu.be/wDQExcKpCH8
Scrimmage videos. Not sure how much he’s in these ones...haven’t rewatched yet.
https://youtu.be/9VppTh5liEc
https://youtu.be/vCGu0m8zXXM
https://youtu.be/IlKipkYrpR4
https://youtu.be/NEkSzjtBpro