On the other hand, there is another cautious opinion that because the Kojiki and the Nihonshoki, and "Joguki" (Record of the Crown Prince) can not be relied on completely from the viewpoint of positivism, the names and family trees of Okimi (king) before the Emperor Keitai are unreliable.
一方、実証主義的観点から、記紀や『上宮記』を全面的に信用することは出来ないとして、継体天皇以前の大王の名や系図等は信頼性に乏しいという慎重な意見もある。