Researchers analysing the data concluded that the galaxies
formed where matter that formed 350,000 years after the Big Bang
relatively clustered together, and then assumed their shape under the
influence of the force of gravity.

There is one extremely important point about galaxies, partuicularly in
this context, and that is that is that they all have a Black Hole at
their center with a mass approximately 0.5% of the total mass of the
galaxy. 350,000 years AUC (Ab Universa Condita) Black Holes had
aggregated but NOT gas and prto stellar material.

The important question to ask is this. Wahat came first the galaxy or
the Black Hole. It would seem the BH.