As a deity who stretches back as far as the fifth dynasty, something you may find of interest is that the Ba of Osiris was worshipped as a deity in its own right. The interest for you will, I suspect, lie in the name ascribed to him: BanebDJEDet, the 'soul of the lord of the pillar of continuity'.
Some have argued that the pillar, known also as the 'backbone' of Osiris is a metaphorical reference for the river Nile, which sustained life through the annual inundation and ensuing harvest.
Osiris is a deity associated variously with resurrection / regeneration in Nature, a solar deity and a lunar deity.
By the Hellenistic period, Osiris merged with Apis under the reign of Ptolemy to unify the Greeks and Egyptians in his kingdom and becomes known as Serapis, which ties in with your extended line including the Serapeum, though I assume you already knew that.
With respect to Nefirirkare and Unas, I lack the technical know-how required to do as you did plotting lines; I must confess to 'imagining' the line extended so I'm quite pleased that Nefirirkare was a close match. Not bad from memory!
An interesting discussion.
Post Edited (28-Apr-14 20:22)