CDG-2 as a Diagnostic Case of Layered Inference Under Weak Optical Accessibility

This technical note examines Candidate Dark Galaxy-2 (CDG-2), identified in the Perseus Cluster, as an observational case in which physical interpretation emerges through multiple partially independent stages rather than a single dominant luminous channel. The system is first indicated through a spatial clustering of globular cluster candidates, later reinforced by extremely faint diffuse emission, and finally interpreted at halo scale through empirical scaling relations. This sequence makes CDG-2 a useful example of how object-level stabilization can occur under conditions of very weak direct optical accessibility. The purpose of this note is not to challenge the observational result, but to clarify the inferential structure through which the object becomes describable. In particular, the case highlights the distinction between detection, stabilization, and quantitative extension, which may decouple under conditions of weak accessibility. As such, CDG-2 is presented as a diagnostic example of layered inference in observational astrophysics, where different components of the description rely on distinct observational and inferential roles.