"Divine Seed... So Dao Wufeng is using the power of the Divine Seed? He truly is the reincarnation of the Martial Saint!" The Heavenly Corpse Old Man naturally did not believe that Su Changkong was the actual Martial Saint, thus the only explanation was that he possessed a Divine Seed.
Divine Seeds possess awareness. If one is not compatible with them, even obtaining a Divine Seed would hardly enable mastery or harnessing of its power.
Generally, the reincarnation of a Martial Saint, the Son of God born of Bloodline Regression, would belong to their own family with Divine Seeds left by ancient ancestors, and such Sons of God could usually easily master these Divine Seeds and utilize the Divine Skills within!
These were genuine Divine Skills. Even if one couldn't exert the full power of the Divine Seed, a partial manifestation of Divine Skills was still far superior to ordinary, fake Divine Skills!