Brother-founder of the Inca lineage; the strength-sibling of the four Ayar brothers. His sealing back into the Tambotoco cave represents the structural mythologem of the elemental-power brother whose unrestrained strength must be contained for the dynastic migration to proceed. Cultural ratification: Pacaritambo / Maukallaqta archaeological site as imperial-pilgrimage destination explicitly invokes Ayar Cachi's sealed-cave huaca status. The pattern of brother-elimination-by-trick during the migration (Cachi sealed in cave, Uchu transformed to stone at Huanacauri, Auca transformed to stone at Cuzco foundation) is structurally the elimination-of-rival-claimants pattern that establishes Manco Cápac as sole Sapa Inca founder; comparative-mythological readings (Urton 1990, Zuidema 1964) treat the four-brother elimination as narrativization of the four-quarters (Tahuantinsuyu) ideology, with each brother's endpoint marking a directional anchor.