It appears that an implicit prediction is that at least a good fraction of dark matter would consist of almost arbitrarily low mass low interaction particles in obscene quantities, that froze out at absurd temperatures in the early universe before momentum-redshifting to near zero velocity such that they behave more like matter than radiation in gravity wells (unlike neutrinos which normally move far too fast to stay bound anywhere).
It appears that an implicit prediction is that at least a good fraction of dark matter would consist of almost arbitrarily low mass low interaction particles in obscene quantities, that froze out at absurd temperatures in the early universe before momentum-redshifting to near zero velocity such that they behave more like matter than radiation in gravity wells (unlike neutrinos which normally move far too fast to stay bound anywhere).