Seicho, who was in charge of construction of the statue at first, was a senior apprentice of Kokei, father of Unkei, and he was a more legitimate successor of the Keiha School than Kokei.
当初の造像担当者であった成朝は運慶の父康慶の兄弟子にあたり、康慶よりも正当な慶派の後継者であった。