In article , jacobnavia
writes:

If a galaxy is found at t=262 My it would mean that galaxy formation was
extremely quick, so extremely quick that it is impossible to believe,
excuse me. If a galaxy is found at t=262 My, then star formation must be
pushed even earlier, at a CMB temperature that doesn't allow for star
formation!

I don't think anyone has an intuitive grasp of such long time scales nor
of star formation. So, saying that it seems quick to you isn't enough.

Sure, but you will agree that we can derive the CMB temperature from the
"z" parameter,

Yes.

and arrive at a conclusion about when the gas would be
cold enough to condense into stars. Note that we are NOT in the realm of
"unknown physics" when the universe had only a few planck times age...

Right. Still, the exact mechanism by which the first stars formed is
not understood. On what basis do you claim that stars can't form above
a certain CMB temperature?

Sure but that TAKES TIME. Time to cool down the searing hot big bang
gases and time to let the expansion cool the universe to allow star
formation.

Right, but how long, exactly, and based on what? "It seems quick to me"
just doesn't cut it.

My thesis here since several years is that there is NO TIME to build
galaxies in just 137 million years.

Yes, you keep repeating it, but have yet to offer any evidence that
galaxy formation requires some minimum time greater than this.