I doubt they would give up Quinn to dump Samuelsson but I think there is a deal to be done between the two. Rackell is the type of forward they need and Rust would be a good addition. Obviously value needs to be balanced out with either of those guys, but Dubas should definitely be calling Buffalo on Samuelsson and the younger guys they have that haven't hit their heights yet.
If the Pens are tanking next year to get McKenna or another in the top 5, from those mentioned in this thread Grubauer with a sweetener for Jarry wouldn't be a bad swap for them and Seattle.
If it gets expanded to include Rust or Rakell while the Penguins are taking Samuelsson back, I'd expect the Sabres to have to include pick #9 this year for that to work.