The reason Hyuga Kagami hurried back from the island where he had left Sasuke was, first, because he was worried about Sasuke wandering the Ninja World alone. Sasuke was not weak now, but if he truly encountered Akatsuki or Otsutsuki Toneri, he would still have difficulty protecting himself.
Second, he needed to return to the village.
With the ritual site decided, all that remained was to spend money.
However, Hyuga Kagami had no money on hand anymore. When Akatsuki launched its last attack, he had spent every bit of money he could as a precaution. So now, he had to raise another sum of funds for the barrier arrangements around the ritual.
As for where the money would come from, he had already thought it through.
After he resolved Akatsuki's last attack, the Five Great Shinobi Villages had agreed to pay the God Organization a commission. Coupled with the village's apology payment for impersonating the God Organization without authorization, the two sums together should be enough to cover all the ritual's expenses.
That was also why he had temporarily switched to a Fire Clone Technique.
After all, having Yama, whom the public mistook for an immortal, personally collect a debt would be rather beneath him.
Moreover, River Lord had some grievances with both Konoha and Kumogakure over the incident where Kumogakure abducted Hinata. Wind Chime had exposed his Byakugan before Kurenai. Jizo could not conveniently explain the origin of Dust Release to Iwagakure. And Kirin was entangled in the relationship between the God Organization and Kirigakure.
Furthermore, when Hyuga Kagami had previously approached the village to discuss cooperation, he had used the identity of Flame Demon. When Itachi and Hyuga Kagami put on an act for the village last time, they had also used Flame Demon's identity. Therefore, Flame Demon