Just a thought - won't happen, but I would consider this:
Nashville keeps Weber.
Sabres send Tyler Myers and a forward (Leino, Stafford, Adam?) to Nashville for Weber and a 1st rounder next year.
Nashville cannot afford the upfront money for Weber; Buffalo could. Nashville gets two affordable players that are ready to go now. Buffalo has the players to deal someone AND gets another first rounder next year (which could be relatively high.)
The key question is: Is Weber better than Myers?