Not really sure what this does for vegas....

Is Ristolainen a RD?

Canucks aren't in a position to trade for rentals

the cost of an upcoming UFA in Montour in this climate to a contending team at 50% retention is a 2nd round pick. No-one is giving Buffalo a 1st plus 2 players least of from Vancouver.
But I can offer Buffalo, Edler at 50% for Mittlestade, Jokiharju and a 2021 1st. This would be a similar proposal to yours.

Edler is not waiving first of all, especially for Buffalo.

I know that! Edler isn't going anywhere from Vancouver nor would I like to see him play for another team.

Where is the first in this trade you keep talking about?

The more this season goes, the more likely it is that Dallas is not a buyer at the deadline. Even if they were, the Stars don't have any cap room to play with once Bishop/Seguin come back over the next month or two. Hall is not going to Dallas.

Even with Hall, it's doubtful the Stars pass the Lightning, Panthers, Hurricanes, or Chicago/Columbus to make the postseason. If Hall as a rental isn't going to make the Stars a Cup contender, they aren't giving up Robertson & a 1st for him....even if they could afford him