In order to rectify the problem of limited energy capacity, the life seed split into two. This split was similar to the division of cells. Every part of the life seed was replicated perfectly within the two life seeds.
The process went smoothly, but it weakened the individual life seed. However, each life seed had a lot of potential to spare and was capable of reaching the peak of the second on its own.
When they reach the peak of the second mortal coil on their own, he would have two life seeds that each possess the amount of energy he had with one life seed when he was at the peak of the second mortal coil.
So his energy storage has effectively doubled. This split solved the lack of energy for now. It also meant that he has reached the first transformation of the third mortal coil.
His breakthrough to the first transformation of the third mortal coil is different from that of Roar because Roar received a life pill that had fused with the natural wonder.