Let us just return the first question. Why does the moon orbit the earth in your aether displacment conjecture?
http://en.wikipedia.org/wiki/Casimir_effect#Vacuum_energy
"a "field" in physics may be envisioned as if space were filled with interconnected vibrating balls and springs, and the strength of the field can be visualized as the displacement of a ball from its rest position"
A 'field' in physics is space filled with aether and the strength of the field is the displacement of the aether from its rest position.
Each of the plates in the Casimir effect displace the aether. The displaced aether which exists between the plates is pushing back toward each of the plates which causes the aether displaced by each of the plates which exists between the plates to offset. This aether is more at rest than the aether which is displaced by the plates which encompasses the plates. The reduced force associated with the aether which exists between the plates along with the displaced aether which encompasses the plates which is pushing back and exerting inward pressure toward the plates causes the plates to be forced together.
What occurs physically in nature in the Casimir effect is the same phenomenon as gravity.
There is no such thing as non-baryonic dark matter. Aether has mass and physically occupies three dimensional space. Aether is physically displaced by matter.
Displaced aether pushing back and exerting inward pressure toward matter is gravity.
The aether which is displaced by the Earth and the Moon which encompasses the Earth and the Moon, along with the canceallation of some of the force associated with the aether displaced by the Earth and the Moon which exists between the Earth and the Moon, keeps the Moon in orbit about the Earth.