With the highest level of permission granted by Pangea, Vaan could access all existing information on the Celestial Network. However, Divine Inheritance wasn't a top-secret method. Thus, he already learned all about it.
According to everyone's understanding, Divine Inheritance could only be performed when the divine cultivators were alive. After all, if the divine cultivators died, their Divine World would harden into Divine Cores or even expand its hardened state.
Under such conditions, transplanting would become difficult. It was the difference between trying to absorb water through the skin and squeezing a lump of rock through.
The former was difficult enough, while the latter wasn't even worth attempting.
After all, water could reform and become whole again. On the other hand, a rock wouldn't be the same even if it was glued back together after getting ground into powdered form.
