It was clear that the Rejuvenation Island Domain was evidently at a dead end. Otherwise, agreeing to split half under such humiliating conditions would be something one would ordinarily never accept.
Even if you're a successor of holy places, gaining benefits, protection, or shelter costs, at most, it's very polite to give you thirty percent.
Taking half directly only shows that the Rejuvenation Island Domain is desperately grasping at straws, entirely out of options.
If they don't act, they can only watch as the Three Talents Island Domain gathers followers to forcibly seize the island group, and even then, the Rejuvenation Island Domain's luck will slump, never to recover.
Once their foundation is continuously undermined, one will lead to two, and two will lead to three.
While the Rejuvenation Island Domain has a vast foundation, this continuous division won't take long before the entire domain is thoroughly divided.