Hunter Brzustewicz is likely the best D-Man in the league.
Guys like Punnett, Parekh, Dickinson, Bonk, Nelson, and Donovan would all likely be placed ahead of Mayer. I’m sure some of the scout types would likely list even a few more.
Mayer is a really good D-Man. Offensively, he is impactful. He’s a big body. Moves the puck really well. He also is a great fit for the 67’s with respect to wha their needs are. he is a better fr than some of the D-Men i have listed. But, to suggest he is the best D-Man in the league would be a stretch.
The 67’s are happy to have Mayer. HE is a great fit for the team. HE came at relatively decent trade value. Much better than Donovan, for example but much more than Punnett. So, if all things were equal, I easily prefer Punnett at a 3rd, 6th and an extra OA body. We didn’t have that OA D-Man available to add to the deal though.