Wearing the mask of Soh.

Yoshiro seems to act through Soh. 

When Yoshiro dances along the Spirit Path to purify, Soh runs around purging defilement. 

They're performing one action, together. 

What Yoshiro is doing, Soh is doing. 

At night, Soh fights the Seethe while Yoshiro dances emphatically. If Soh is struck hard enough, Yoshiro is affected. (Cut-scene only)

Soh is definitely tethered to Yoshiro. 

I often felt like Yoshiro metaphorically 'wears' the mask of Soh and acts through Soh.

Parallels once again.

Normal Ending

True Ending

Flower motif...

Cursed Soh's sheer flaps that hang from her hips look like wilted flower petals(compared to Soh's healthy ones). Her long red nails are visually striking in her 3D render.

The Divine Maiden.

The Sacrifice

Why are there skulls here in this place where the Divine Maiden undergoes the 'Sacrifice' ritual? 

It almost gives the impression she dies and returns as a spirit. And she has Soh's face. 

I thought it might be to call upon ancestral spirits but the title is 'The Sacrifice'. Unless it's the acknowledgement of what happens to the Maiden when she walks the Path as she suffers and eventually becomes the Spirit Stone.

Ceremonial Processions PREPARATIONS

Kunitsukami

Then come the Ceremony Processions where everyone gets their masks. Then we see Soh fighting Seethe.

Maybe The Sacrifice is her giving up her life to eventually become the spirit stone. But it really does seem like the Maiden is split into two beings.

I think a lot is lost in translation or tied to cultural knowledge. Knowing Soh means ancestor(or Esteemed One) and that Soh does not actually have a name is pretty important lore. But the name thing was only revealed in the play.

Soh being Soh.

This gesture always amuses me. It reminds me of Soh's reaction to Yoshiro imitating her on the title screen.

Little details...

These things remind me of the sheer fabric on Soh and Yoshiro's outfits. Soh has 8 little flower flaps but Yoshiro only has 4.

The Cycle.

Yoshiro and Soh are one being forced into a cycle. 

Yoshiro is forever reborn to be the Maiden. 

Yoshiro holding a mask at the end, the new Maiden seen with a mask hints she's been reborn. 

I thought she became the new Soh but considering lore, they each play their roles forever.

Just a theory but this one seems more likely than Yoshiro and Soh switching roles.