Since Earth's moon consists of fewer sub-atomic particles than those that make up the Earth, there is a smaller volume where quintessence is absent when compared to the Earth. Therefore, the push from quintessence is less restricted by the moon. Hence, the difference in the quintessence push from the volume of space encompassed by the moon versus the volume of space encompassed by the Earth results in what we experience as the pull of gravity.
The quintessence concept follows from diffusion of particles in dense Aether model of AWT and it corresponds the "ultramundane flux" (i.e. flux of tachyons or gravitational waves), which was conjectured by Fatio/Le Sage theory of gravitation (1690) before more than three hundred years.
The usage of new denomination for classical well known concepts of former authors without quotation violates the principles of Occam's razor and scientific priority and it's called a plagiarism. In this case it's rather an another attempt of mainstream proponents to cover the apparent fact, they fighted against Aether concept for many years, while adopting Aether ideas quietly on background - thus fooling the publicity and itself (the usage of Lorentz invariance or Lagrangian and Hamilton mechanics borrowed from Aether theory is the problem of the same category).
In dual way, we can consider introduction of quintessence concept like attempt, how to avoid the censorship of peer-review during presenting of extrapolations of Aether theory. Every sectarian community doesn't allow and tolerate mistakes in the eyes of publicity, which leads to reintroduction of formerly misunderstood ideas under new names. Such behavior is even more stupid and amoral, then the stance of Holy Church, which simply refused scientific ideas - but it didn't stole them for the sake of its theology.
In AWT the dark energy is the mechanism dual to dark matter, i.e. the surface tension of density blobs of vacuum, which are source of gravity field and gravitational lensing phenomena. On the outer sides of every blob the gravity field is of negative curvature, which leads to repulsive force at the distance. The same effect is responsible for weak nuclear force at short distances or for repulsion of mercury droplets at human scale. It means, when massive objects during inflation achieve certain critical distance, they're repelled by repulsive force instead of attraction.
Neither AWT, neither relativity theory are forced to consider quintessence at all, because
- omnidirectional expansion of space-time is one of implicit consequences of general relativity (a positive or negative cosmological constant)
- the omnidirectional expansion of space-time in connection of curvature of space-time concept of gravity field in general relativity leads to the very same effect, like the quintessence.