What was different between Satan and Junior was that unlike Junior, who had gathered enough natural energy, Satan was still lacking a little before he could become a true Nature God.
Without Sui Xiong, Satan definitely would not have been able to obtain his priesthood.
Even without discussing other matters, just the will needed for this priesthood in resisting those ancient grim reapers was not something that every legendary peak master could muster.
Furthermore, the ancient grim reaper who was buried at the lower part of Ashes Forest was not an ordinary character. In the ancient times, he had engaged in conflict with the Goddess of Life over the right way to live life and had even engaged in a large war with her!
If not for Sui Xiong's help, the fact that the purification array had extended into the ancient grim reaper's body alone and clashed with his remaining will would have killed Satan and taken his life!