> A majority of motifs in Lord of the Rings use ostinato whether as a
> accompaniment figure or as melodic material.

Ok, yes, as accompaniment figures, that is true. You can even hear this in the Hobbit trailer music.

> Shore's string section is heavily orchestrated: the strings most commonly play > divisi to create a dense chord.

Also true, but I think a lot of people miss the other instruments playing in unison with the strings (commonly woodwinds). Doug Adams talks about this in his book about the music. A lot of it sounds like strings, but there are actually several instruments across the orchestra making up a single chord. It's what gives the LOTR scores such a unique tone, even when they're playing something very simple. That's also what makes them heavily orchestrated.