Shō Hashi
Ōbayashi provided two types of evidence for the tripartite hypothesis. One is justifications for the unification by Shō Hashi. Shō Hashi took over King Bunei's Chūzan because the king had not exercised juridical powers properly. He then destroyed the King of Hokuzan Han'anchi, who had been known for extraordinary military prowess. The official history book "Kyūyō" records two theories regarding the downfall of King Taromai's Nanzan. One is that he lost public support because of his extravagant lifestyle. Another story is that he lost support from the peasantry after he exchanged his domain's lifeblood spring for Shō Hashi's gold-painted folding screen. In other words, he lost his country because he relinquished the source of productivity.