A clinical picture published in The Lancet reported an adult male with long-standing hydrocephaluswhose cerebral mantle appeared extremely thinned on imaging, yet who retained everyday social andoccupational function with low-normal psychometric performance.[1, 2] This single case is frequently(and often sloppily) invoked as “proof” that brain volume is irrelevant. We propose a stricter readingframed by MetaTime: an effective theory in which macroscopic dynamics are constrained by aprocessing budget and where the dark sector is represented phenomenologically as an interactingpair of components (Latency and Inference/Execution) coupled by a covariant exchange Q(a).[3]We reinterpret the Lancet case as a boundary condition supporting a gauge-invariant functionalof cognition: under slow geometric deformation, cognitive capacity can remain approximatelyinvariant if the system preserves a high-connectivity causal graph (“latency stock”) while adapting itsexecution pathways under energetic constraints. We formalize this via an operational variable Πcogdepending on causal connectivity and thermodynamic cost rather than Euclidean volume, and we listfalsifiable neurophysiological predictions (connectome compensation, complexity-without-volume, andmetabolic trade-offs) that would distinguish this account from naive volumetric narratives. Finally,we clarify how higher-dimensional or entanglement-inspired language can be used consistently as acorrelation–geometric metaphor while preserving relativistic no-signaling and local energy accounting.