So does that mean there are some galaxies without dark matter - because of a previous collision? And then some dark matter only galaxies, because they left thei

So does that mean there are some galaxies without dark matter - because of a previous collision? And then some dark matter only galaxies, because they left their galaxy behind? I suppose this is unknown - but does the dark matter reappear in the galaxy later somehow, or it's left behind forever? Edit: well there are galaxies without dark matter (maybe) [1] and there are dark matter galaxies [2] [1] https://www.space.com/19-galaxies-missing-dark-matter.html https://www.space.com/19-galaxies-missing-dark-matter.html [2] https://www.space.com/33850-weird-galaxy-is-mostly-dark-matter.html https://www.space.com/33850-weird-galaxy-is-mostly-dark-matt...