I am going to go against the flow here.
As a Sabre fan, I would make that trade.
First, Myers is far from being a bad defenseman.
Go to https://public.tableau.com/views/SKATR2019-2020/SKATR?:embed=y&:display_count=y&
howVizHome=no#3 for a snap shot of his analytics.
I would like to see Myers return to the Sabres, he played well here and we lost him in a bad deal with the Jets.
Second, While this is not a great draft the 9th and 40th (Arizona forfeited their pick) alone is a decent return for Sam.
As comparison those picks have about the same value as the 16th and 22nd OA.
I think most Sabre fans would be happy with those two first round picks for Sam.
Third, MacEwen would add a little toughness to the team.
Fourth, with Myers back on the team, Buffalo could move Ristolainen for additional picks.
I am all in on this trade, it is a good return for a player who seems to want to leave Buffalo.