I think dark matter is just very faint ordinary matter. I've seen long-exposure photos of the Sombrero galaxy and they show a gigantic halo, dwarfing the disk into a tiny dot in the center. And more recent estimates that brown dwarf stars far outnumber all other types in the Milky Way: most nearby brown dwarfs have not been found because they are so faint as to be invisible. I can't imagine that dark matter can be described as anything other than its namesake: just dark, dark, dark, ordinary matter, made dark by distance and size.

IMO Dark Energy is what a black hole does to matter in it's interior. It is a space-contraction and time dilation that first contracts the universe, then relaxes it. The apparent positions of galaxies slowly return to their geometric positions. It is the radial version of a gravitational lens. A gravitational lens moves the image of a distant object tangentially. A black hole event horizon moves the image of a distant object radially, first inward, then outward. And nearby objects are crushed into quagma, which then forms protons and elections, which then form hydrogen and helium in just the ratio that we'd expect, with a high potential energy and low entropy.

The reason I think black holes reduce entropy is because nothing can escape from a black hole, not even heat, the supposed end-product of the ordinary chemical and nuclear reactions that we base the 2nd law of thermodynamics upon.