Storm father is the piece of Honor
Nightwatch is the piece of Cultivation
Unmade were made and then unmade and the sibling is "sleeping." What if the unmade were splinters of Odium like the Shards are splinters of Adonalsium? Kinda like an evil Voltron. That would be why the Stormfather doesn't want them to wake the sibling. If those 10 pieces of Odium get together they would be a powerful manifestation of his will on Roshar