But in the 1980s, the possibility that the creation of "Joguki" which records the origin of Keitai would go back to the reign of Empress Suiko (Hiromichi MAYUZUMI 'A Denealogical Study of Emperor Keitai' "Ritsuryo kokka seiritsushi no kenkyu"[Study of the establishment of the Japanese nation under the ritsuryo codes] Yoshikawa Kobunkan Inc. 1982), was brought to light and the collateral line royal family theory regained momentum.
ところが1980年代に入り、継体の出自を伝える『上宮記』の成立が推古天皇朝に遡る可能性が指摘（黛弘道「継体天皇の系譜について」『律令国家成立史の研究』吉川弘文館、1982年）されて、傍系王族説が再び支持を集めるようになった。