The main reason Erik had to wait was because he needed to reform his army. As usual, in these three months, he had been able to create around 45,000 new Chimaeric Demons. Some of these came with the new technique the biological supercomputer created, the one that would allow them to make new neural links faster. All of them, instead, had Monica's brain crystal power, so they were bound to be strong.
Using 70 million DNA points came with its perk, and despite everything, the biological supercomputer came up with something that allowed them to increase their training speed a lot.