Astronomers Disturbed by the Unexpected Scale of James Webb’s Galaxies

The Big Bang isn't an explosion in space. It's an explosion of space.

There isn't anything to push out of the way. The space itself for those galaxies to be in didn't exist.

It's the space itself that's expanding. One interesting property of that is that it can expand faster than the speed of light. Objects within space can't do that.

So there's no way for there to be pre-existing galaxies that we're just belatedly observing. (And incidentally, even if there were, they'd have been destroyed by the hot, dense state prior to the recombination event that gave rise to the Cosmic Microwave Background.)

I agree with the question. Something as big as the Big Bang happening once and only once is quite an anomaly to believe in.