Okay, does it just seem to me that there's another challenge here from RL: "find the clue"?
Alright, let's have live burial and spitting on corpses. But why the pillows?
Why am I so defending the King of Shamans? Because, for example, this connection is obvious to me. Anyone who watched the opening theme of a series as a child knows it just as well as Moonlight Densetsu (the opening of Sailor Moon). But that's me, an anime fan with experience (I think, like Revan), for others, it might not be obvious at all.
But let's still work through all the options.