At this point my knowledge probably pales in comparison to skimming some Wikipedia articles, but my understanding is that there is just so much dark matter conc

At this point my knowledge probably pales in comparison to skimming some Wikipedia articles, but my understanding is that there is just so much dark matter concentrated in these halos and inter-galactic structures of it that the gravitational effects of baryonic matter are negligible in comparison. I believe dark matter comprises something like 80-85% of all matter in the universe.