In the Kawachi Dynasty Theory, there are different opinions as follows: One by Kojiro NAOKI and Seiji OKADA that a Kawachi power which controlled the Seto Inland Sea to enlarge its power conflicted and overthrew the first Yamato Administration, another by Masaaki UEDA that after the fall of the Miwa Dynasty (Sujin Dynasty) it was succeeded by Kawachi Dynasty (Ojin Dynasty), and the other by Mizuno and Inoue that a Kyushu power invaded to the area surrounding Kyoto and Nara as conquerors during the reign of Emperor Ojin or Emperor Nintoku.
また、河内王朝説でも直木孝次郎、岡田精司の瀬戸内海の制海権を握って勢力を強大化させた河内の勢力が初期大和政権と対立し、それを打倒したとする説や上田正昭の三輪王朝（崇神王朝）が滅んで河内王朝（応神王朝）に受け継がれたとする説と、水野、井上の九州の勢力が応神天皇または仁徳天皇の時代に征服者として畿内に侵攻したとする説とがある。