Might Duy had his reasons for choosing to pass the Eight Gates Formation Technique on to Meikyō. The prototype of the Eight Gates Formation came from the Second Hokage, while Uchiha Meikyō was Tsunade's disciple and closely related by blood to Kagami Uchiha, the Second Hokage's disciple. In most people's eyes, he belonged to the true, legitimate Hokage lineage. Moreover, Might Duy was deeply grateful to Meikyō for eliminating the countless hidden injuries in his body and even supporting him and his son under various pretexts.