Well, Sigismund marrying Mary seems rather counterproductive if his father would want Polish crown for him, because only way Sigismund would get it is him being supported by anti-Angevin, anti-Hungarian party in Poland and Bohemia waging succesful war on Hungary. The wishes of Poles will be ignored by Elizabeth of Bosnia if Louis would have a son, which I imagine would make Poles more receptive to Luxembourg claim.
Durazzo ain't getting anything, the marriage would just cement his father's claim to Naples, the idea that the strongest state of central Europe would give up Croatia, which they held since approximately 300 years.
As far as Lithuania is involved, I doubt Poles and Hungarians will have opportunity to take anything, since they would be busy fighting each other.