Going Full-Time.
The news that the leader's Leviathon body left was known to only a few important leaders of the Sebastian Warriors Army.
The impact was not much either. Even if the soldiers knew that the Leviathon already left, they would not feel it much since in a sense, their leader was still with them in the form of the main Megalodon body.
The more Sebastian's responsibility and power grew, the more he appreciated the utility and convenience that his doppelganger and invisibility unique skill brought, the unique skill was just too versatile.
With his Leviathon body leaving, Sebastian successfully divided himself into 3 and was now working at the efficiency of 3 talented personalities.
Whereas his Atlantian body was leveling up in the Green Mist Sea and was taking care of his Anatomy organization, his main Megalodon body was leveling up here and was taking care of his army, while his Leviathon body explored.