We are talking about at most 2 new defensemen in the lineup, and at least one of them will be Liljegren who has already been in the organization for a long time. Sandin should not be here next year, but he will be in the 7/8 slot.
Rielly - Brodie
Muzzin - Holl/Dermott
UFA - Liljegren
RD UFA
Sandin as the primary LD callup from the AHL. RD UFA can be a guy like Tucker Poolman or Hakanpaa. 3rd pairing UFA can be Nemeth, Suter, Hjalmarsson, Cole, Goligoski, etc.
OR
Rielly - Brodie
Muzzin - Liljegren
Dermott - RD UFA
RD UFA
Sandin as primary LD callup. Poolman or Hakanpaa once again for the 7th position; Hjalmarsson (can play RD), Cole (can play RD), Ceci, Goligoski (can play RD), Hamonic, Savard, Bogosian, etc. for the 3RD spot.
I would not be against moving one of Holl/Dermott regardless of what happens with expansion. It would probably be easier to acclimate Liljegren into the lineup if we do, and I think our defense will still be very strong even with those changes.