To be honest, first person POV is probably my least favorite POV and I had gotten used to the second person POV for Path. It made it a more unique experience, as not many stories use that POV.
That being said, first person POV has advantages of its own, some that I already noticed in this update, so with a bit of time to acclimate it shouldn't be a problem.
Anyway, enough about that.
Zhi's musings on the nature of Kukuni is reflective of his biases, certainly, but there is certainly some truth to his limited information about them.
Kukuni might not be quite immutable the way they are perceived, but they might be slow and difficult to change, enough so that they get a reputation for it.
Perhaps that is the benefit to bonding that the Kukuni get. They change and grow faster and more easily, or become more versatile than they otherwise would be.
Chui would be especially suspecible to that, being a newborn spirit.