Regarding my theory that the earliest annihilation of matter and anti matter created a form of matter like debris has more evidence since we have shown that photon collision can produce matter. That was thorized 80 years ago but now we have a photon collider that can do the trick. https://www.imperial.ac.uk/news/149087/scientists-discover-turn-light-into-matter/ It is not known if that matter is visible or invisible like dark matter.

Rejoice, speculation enthusiasts and free thinkers, I am undeterred by idiots and their toadies.
What is knowable does not come pre-assembled in a box on the porch. Nor are facts a discreet black and white certainty. It's good to think outside the box.

Current thought says the universe is 13.8 billion years old and 90 billion light years across. We have equations to estimate the mass of the universe. Only 3 solar masses can make a black hole. How much trillions of stars, non luminous matter plus dark matter and everything else over a gradual decrease in density by expansion will have black hole qualities, is the question. How long it takes to release the boundary of light is calculable. That includes microwave background radiation. Solving the equation without the magical thinking of Inflation theory is more simple to me.