Hmmm. I thought that by it’s very nature dark matter couldn’t be detected. Like String Theory or Multiuniverse Theory this more resembles theology than science.
Since dark matter is supposed to suffuse the universe shouldn’t it be detectable everywhere? And if it is undetectable then it is crackpot theory. “We have all the answers. So send us more grants. We can’t prove any of it but send us more grants. Giant flaming dump trucks full of grant money!”
If it couples to gravitation there would seem to be large masses of the stuff all over the place, crashing into visible masses which also couple to gravitation. However, this is not observed anywhere.
Why not?, I’d ask cosmologists.