When Ves originally came up with the concept of a companion spirit, he quickly developed concerns about control.
A companion spirit originally came from a part of a person's spirituality. Ves essentially scooped up a portion of someone's spirit and infused it with life, causing it to develop a measure of independence.
However, Ves always made sure to make the companion spirit both loyal and subordinate to its originator.
He never grew concerned that Blinky would grow out of control because of these measures.
The issue was that nothing was absolute and any companion spirit could mutate in ways that contradicted their initial design.
That was the effect of life and growth. Companion spirits were never static and always grew over time.