Since it was believed at that time that the Toyotomi side could have a good chance to win, it is sure that Morichika joined the Toyotomi side to recover his former territory.
当時としては豊臣方に勝利のチャンスがあると考えられていたので、盛親が豊臣についたのは旧領奪回の打算があったのは間違いない。