In the past, in order to create a Super High Risk Esper Ability, he had captured Espers ruthlessly without ever considering the consequences. After fusing countless abilities, he had obtained the genetic chain of [Energy Control]. By then, as his original body's ledger was already filled with blood and his life span was ending, he thought of starting a new life.
Hence, he had hidden this ability all along and never shown it. He had secretly chosen 'Gaud' as the container for rebirth and planted this part of his Esper Ability genetic chain into Gaud, planning to inherit this ability after his rebirth. He then killed all his subordinates who knew about it and made sure that this identity had a clean background.
The core of this plan was [Esper Ability—Rebirth]. This was an ability that could only ever be used once, giving the user a second life. It was not a pure soul-type Esper Ability but was related to the High Dimensional Information Form.