Great review, however melodic Continuity does exist in the 2 Hobbit scores : it relies in the Durin theme you can hear in AUJ "My Dear Frodo" (0'00) , A Good Omen (0'30) and in DOS with "Girion, Lord of Dale"(3'05), "In The Shadow Of The Mountain" (0'00), " A Spell Of Concealment", "Hunters", " My Armor Is Iron".

My opinion is that there is also a Legolas theme, obvious on screen, but you eventually called it a second theme for Tauriel.