Evidence that he made all the stars simultaneously with a snap, like you are implying?
The Soul King lived for literally millions of years, and has plenty of time to stabilize and shape his creation. If he is 4-C, then we are assuming he can make at least one star with relative esse. Under this condition, he'd fill the skies of Soul Society with stars relatively quickly, as there are only about 8,000 stars visible in our night sky.
All that is required for the Soul King to reasonably make the stars of Soul Society is the capability to make a single star, the necessary range, and time.
So yes, I think 4-C is fine but anything beyond that is unfounded.