Liu Jie was already 25 years old, at a suitable age to contract a sacred source lifeform.
On the other hand, it was anyone's guess how much more time the Mother of Bloodbath needed before it reached Creation Breed.
Lin Yuan did not know how much the Mother of Bloodbath could improve by consuming a stick of the Blood Brew Grapevine's Blood Brew Grapes.
Even if he ordered Red Thorn to maximize its efforts in allowing the Mouth of Relinquish to absorb flesh energy and produce Eyes of Relinquish and nurtured Blood Brew Grapevines to quickly grow Blood Brew Grapes, he had encountered a true glutton.
Compared to the unpredictable state of the Mother of Bloodbath, it was a better choice to allow Liu Jie to contract the sacred source lifeform.
As for Zhou Luo, who had gone through hell and back with him in the dimensional rift, Lin Yuan did not plan on giving him the sacred source lifeform.