As they were not good in quality as compiled historical materials of those days, nor exactness can hardly be expected in the descriptions of Kiki, if the described matters were basically before Emperor Keitai.
なぜなら、それらは同時代史料でも良質の編纂史料でもないし、そもそも継体天皇以前の記紀の記述に、あまり正確さが期待できないためである。