I'd rather they not trade for a Top 4 RHD. Wait til after the expansion draft to trade for one or sign one as UFA this way they don't have to make deal with Seattle to not pick a Dman.
I know it sounds like conceding defeat but i think this team is neither a contender nor impossible to make the playoffs, if they make the playoffs as 7th or 8th seed in the west then fine, if not there is nothing to be stressed about.
After Seattle has taken one Duck player (possibly a Dman like Guhle or forward like Henrique) then Ducks can acquire after the dust have settle from the expansion draft.
If Seattle hasn't chosen to take Guhle then they can acquire a RHD & then move Guhle in a trade.
Buffalo has a surplus of Gman. They will find someone to partner with before the ED to trade Dmen.
As of 2021 off season assuming no trades buffalo has
Exposed or protected
LD Dahlin, Pilut
RD Risto, Montour, Miller, Borgen
Unsure..RD Joki
Exempt
RD Laksonen , Fitzgerald
LD Samuelson, Johnson, Bryson
IfBufalo is trading say Risto they will want a player they plan on protecting in the ED.
If thry go 7-3-1 thrn the certain forwards protected would be
Certain ..Eichel, Skinner , Reinhart, Mittlestadt, and Olofsson
Others exposed...Thompson, Asplund, Smith, a few others
Exempt... Ruots, Pekar, Cozens
If they trade for a forward they would want one that is clear improvement on the pool of players thry decide from on who to protect
If buffalo trades Risto for picks or younger players thrn the players they get they should be exempt from ED