His ritual and sacrificial techniques aren't very advanced, but he still has a keen eye.
To make up for the missing parts, you need to have the materials, knowledge, and skills all in place first.
Unfortunately, many of the materials used here are already extinct and gone forever.
Even if they know how to make up for it, they can't find the materials anymore.
Replacing the materials requires adjusting the whole structure. If they had that capability, they wouldn't need to use this sacrificial altar framework.
In the end, there's only one way to forcibly make up for the flaws.
Blood sacrifice.
The life souls and flesh of many living beings are the most invincible substitutes in sacrificial techniques.
In the Ancient Early Period, blood sacrifice was almost standard for those causing trouble. Even if the sacrificial technique could be completed without it, they would still use blood sacrifice because it could forcibly raise the upper limit.
