 Because there has been little to no modern excavation in the canyon, the question remains largely unanswered.Lynne Sebastian suggests that any analysis based on a strict dichotomy of ritual versus political purpose is inherently misguided, because the Chacoans were most likely deeply influenced by both.Lekson believes that by the later period (1075 to 1140) "Pueblo Bonito, Chetro Ketl and Pueblo del Arroyo ... together with the numerous other structures in the central canyon, should be considered a coherent analytical settlement unit."