Unfortunate lack of time being an obstacle to giving comments proper, I'm nevertheless willing to let you take a glance at the following thread by
piosenniel, where she developes interesting idea as of the fellowship being a parallel, or model to 'original' fellowship - that of the Valar, including Melkor, the latter playing 'Boromir's part' in 'original' break up, with a significant difference, o'course - he repented, Melkor did not. Interesting speculation, I'd say, so see more at the thread itself:
The Original Breaking of the Fellowship
cheers