Older galaxies are far more complex than scientists previously thought how they should look according to theory. Older galaxies are redshifted. Some galaxies are stretched out because of an effect called gravitational lensing that allows us to see galaxies father away, some are really old and unique. It stands to reason if the Webb telescope can see more detail than Hubble, something better than Webb would see more detail and see further back in the universe. Webb very well may find something even older than 14 billion years, we have to wait and see scientists haven't been studying the universe with Webb for decades like Hubble. There are parts of the universe we simply can't see, it stands to reason there may be really old galaxies older than 14 billion years old and we have to revise mainstream theories. If galaxies are being found more complex than thought, there could be even older galaxies.
Mainstream science want to fit everything into what they think about the big bang, but we don't even know if the background cosmic radiation is from a massive cosmic event and not the start of the universe.