Meanwhile, in the Profound Pearl of Life, Vaan completed his aura avatar and began to superimpose it over his physical body from the front side. At the same time, life avatar merged from behind.
In order to achieve the theorized divine body in the Heaven Forging Dragon Art, his physical body had to be perfectly fused with the aura avatar on a 1-to-1 cellular scale.
The life avatar was only there to help with the fusion process.
However, while aura existed and was formed inside the body, this seemingly intangible power only flowed in free spaces outside of blood, which was its natural carrier.
If humans didn't have the seven orifices and countless pores, aura users would have never been able to release aura power outside their bodies. It would have simply been trapped inside.