The reason why successive lords of the domain since Nagakiyo were particular about a move of the jinya is that Shiba Village (Iwata Village) was located in the center of the territory and convenient for doing anything; whereas Kaiju is an inconvenient place to collect land tax.
ちなみに長清以来の歴代藩主が陣屋の移転にこだわったのは、戒重が年貢収納に不便な土地だったのに対し、芝村（岩田村）が藩領の中心地で何かと便利だったためである。