I like it.

Walker or Roy will be traded. Durzi stays

Roy would make even more sense for Buffalo.

Holtby would a great addition and I like your line up.
I would keep the second and count on Laaksonen for RHD and Johnson or Samuelsson as the third LHD.
Oleksiak seems grossly over paid especially as our 3rd LHD.
Roy is an option if the price is right, .
You know PK may want to play for Buffalo if Malcolm is still on the team.
He may not be producing at a Norris level but would be Buffalo's best RHD now.

Oleksiak plays RD in Seattle, he is decent defensively and physically, he can also fight. They can switch sides with Dahlin if need be. I doubt Laaksonen perspectives in Buffalo, we need a defensive top 4 RD now, Laaksonen PP QB, but maybe he will get a chance in the offseason or after TDL.

Probably Malcolm Subban will not playing in Buffalo next season and PK Subban doesn't seem like the best player for Buffalo to me. I would have signed Manson or Lyubushkin instead of Subban then.

Let's agree to disagree then.
i know you will disagree with this Subban is better than Roy, Manson or Lyubushkin and he would be free.
Why not keep Malcolm? He could be Luukkonen's back up unless we could convince another GK to sign on to a team that has missed the playoffs 11 straight years.

Of course, I disagree, because I think that PK Subban is not quite what we need.

Because he's bad, he looked bad pretty much everywhere he played, he's not an NHL goalie and Buffalo needs an NHL goalie, preferably in the last 2-3 seasons he has a 91%+ save stats.