This paper develops a saturation-boundary interpretation of galactic black holes within the Aether Physics Model (APM) and Quantum Measurement Units (QMU). Rather than treating singularities as points of infinite density, the model proposes that gravitational collapse terminates when local Aether occupancy reaches a maximum allowable state. This limiting occupancy is determined by the maximum Aether density, $$\rho_A = m_a / volm$$, where $m_a$ is the Aether maximum mass and $volm$ is the quantum volume. A dimensionless occupancy coordinate is introduced, $$\chi = \rho / \rho_A$$, which provides a bounded measure of geometric saturation. The limiting condition $\chi \rightarrow 1$ corresponds to complete Aether occupancy and the formation of a saturation layer. The model therefore replaces infinite-density singularities with finite geometric boundaries defined by maximum occupancy. The Bipolar Trumpet Coil Model is reinterpreted as the geometric structure assumed by the saturation layer. Rotational closure, magnetic charge, and curl-based geometry organize saturated Aether units into a bipolar trumpet-coil configuration that stabilizes the boundary. Larger galactic centers do not require densities exceeding $\rho_A$. Instead, additional mass is accommodated through the recruitment of additional saturated Aether units, increasing saturation-layer extent while preserving a common limiting density. The paper further introduces the concept of a universal closure coordinate. The occupancy coordinate appears naturally in multiple independent APM investigations, including cosmological dilution, thermodynamic excitation states, geometric closure relations, and maximum-density saturation boundaries. The recurrence of the occupancy coordinate is presented as an observation rather than a conclusion and suggests a possible future avenue for geometric unification within the Aether Physics Model. The resulting framework provides a finite, geometrically bounded alternative to conventional singularity models while establishing a direct connection between black-hole structure, trumpet-coil geometry, and occupancy-based closure dynamics.