okay, new idea. You don't get gravity without spacetime, so the first spacetime bubble from the big bang had to be around to allow the supermassive blackholes to form. But after they did their thing and a galaxy formed, the spacetime bubble around the galaxy broke away from the main bubble.
You are full of imaginative ideas, which is not a bad thing.
The base of all scientific endeavor is imagination.
However, science also requires that the ideas mesh together to form a consistent whole.
Your ideas just seem to bounce around randomly...