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.