This is purely due to salary cap restricitions. The Knights are currently $7.5M over the Salary Cap. Vegas is able to dump $8.85M in cap space by moving Eakin & Smith. Given how little leverage the Knights have in any negotiations, they will likely have to move a valuable prospect/pick to entice a team to help them out.

Dallas gets the RD that it needs in it's prospct pool, along with a more expensive replacement for Faksa and the top-6 scorer they need.

Vegas gets a two-way guy that is better, and cheaper, than Cody Eakin, along with a couple of prospects that are still a year or two away from seeing NHL time. This preserves the Golden Knights limited salary cap space for at least the next couple of seasons.

This is contingent on Toronto finding someone to take on Zaitsev & Kadri's contracts.

Honka would be a much cheaper replacement for Zaitsev, and could turn out to be a really solid bottom-4, puck moving defenseman if he is given the ice time. His advance possession numbers are actually pretty solid.

Janmark won't ever be a replacement for Kadri, but if Toronto were to move someone else up into Kadri's 3C role, Janmark could slot into their bottom-6 spot in the lineup. He's a quick, shifty skater with good skills on the PK. Won't be a 40+ point per year player, but he's a more than servicable bottom-6 guy.

Between Lindell, Heiskanen, and Oleksiak, Bayreuther could very well be the odd man out. Dallas has an abundance or LD in their prospect pool that they would be able to call up in case of injury (Djuse, Hanley, Heatherington, etc.).

In TVR, Dallas gets a 3RD to play behind a (hopefully) healthy Stephen Johns. Should Johns not be ready for the season, the Stars would start with TVR as their 2RD and Polak as their 3RD.

Similar to Dallas Left Side, Carolina's Right Side is pretty stacked. Between Hamilton, Faulk, and Pesce, TVR could find himself playing on his off hand, or pushed out of the lineup altogether.

This deal clears up a log jam for both teams, and gives them a bottom pairing defenseman that can jump in right away and eat up some minutes at the NHL level.

Helps out the NHL's 4th worst PK unit.