This paper documents two typological phenomena and explores their possible connections. Track A: the grammaticalization of "head" nouns into reflexive pronouns (HEAD→SELF) clusters in the Caucasus at rates above the cross-linguistic background. A Bayesian generalized linear mixed model (brms with rstan backend; Bernoulli family; formula: bpdr ~ caucasus + lat_c + lon_c + (1|family); weakly informative priors; 4 chains × 2,000 draws) yields a Caucasus effect of OR = 10.30 (95% credible interval [1.82, 55.86]; 99.4% of posterior mass positive), based on 2,463 languages across 216 families from Grambank. The family-level Fisher exact test (4/7 Caucasus families vs. 27/196 globally) yields OR = 9.62, p = 0.0076. The same grammaticalization pathway is widespread across Afro-Asiatic, attested with independent lexical roots in five of six branches. Track B: Great Andamanese and Kusunda — both isolates in geographic refugia — share a structurally parallel body-zone noun classification architecture not attested in any other documented language family. A peer-reviewed reconstruction of Proto-Kusunda (Spendley 2024) independently identifies the parallel, describing the Kusunda system as "strongly reminiscent" of the GA morphology. The paper proposes an elaboration model in which body-zone classification may represent the full development of the HEAD→SELF tendency under conditions of extended small-population isolation, and explores a substrate/dispersal interpretation as a hypothesis for future testing. All quantitative analyses independently verified in R Core 4.3.2 (base R stats package). Seven supplementary data tables provide the full dataset for independent replication.