“Most galaxies formed at about 3 billion years after the Big Bang, but some formed earlier.” Prove it.
I think I am safe saying that none of us were there to witness this. All of this is based on empirical data and the conclusions may or may not be correct. Just like most of us now believe that the Earth does not ride on the back of a turtle, but that was not always true. This is just the latest that some scientists believe to be true. You are welcome to argue your points too.