Actually, Xie Xuanyi was not a "Reincarnator" in the true sense of the word. His "rebirth" was entirely different from the "reincarnation" of the Taoist Fan Yin Temple.
Both True Master Jun Shan and Miao Zhen initiated their reincarnations at the cost of ending their lives prematurely.
They were gambling.
For them, dispersing their cultivation and achieving premature transcendence meant a high chance of complete annihilation.
But Xie Xuanyi's "rebirth" was not a gamble.
It was an inevitability brought about by fate and opportunity!
With the Undying Spring left by Zhao Chunyang and his plunge into the North Sea, even if he were to fall into slumber, a resurgence was inevitable.
His physical body remained, and his Divine Soul had not shattered.
That was the difference between him and True Master Jun Shan and Miao Zhen... In a way, True Master Jun Shan and Miao Zhen were no longer completely "themselves" anymore.
