Iemochi allegedly thought that although Yoshinobu was smart, this made it highly possible that he would end up outsmarting himself, while Kamenosuke on the other hand, was young having him as shogun would create the best management of the bakufu possible through agreement of the cabinet officials of the Shogunate.
家茂は、慶喜は優秀ではあるが、それゆえに自策に溺れる可能性が高いのに対し、亀之助は幼少であるがゆえに幕閣の合議により最上の幕府の運営が出来ると考えていたとされている。