i guess other important thing in all structure is the time line of the cores.
Every core is situated in a different time line. Note necessary to define what core came first, but they have different eras and technology.

the triangle of the sustenance of the time line is composite by:

First Era Second Era Third Era
Magic Reason Technology
All eras end with something, a disaster, purification or apocalypse. When one era ends, other will start, and all 3 cores will start after a big event.

Just a example of reference.

We live in earth in a era of the reason, going to totally technology era. So the other cores need be in the other of the 3 points of the triangle.
One with magic ruling and other with technology. The earth passed for 2 big events changing the era, something like big water flood putting the end in a era starting to hide all magic in the world, it as a big process, finishing only in the 1st and 2nd war, when definitely the era over. Now earth wait for other huge event, some believe in a 3rd war, other in Apocalypse, other believe that the both are the same. What really doenst matter, the important is the change of the era.
At this point the other 2 cores passed by big events to, changing the era, one world with a damn advanced technology, came back to the primates era, starting again the evolution of the spirit and magic, and the other core, just went to a cyber technology era.

Cool believe in the theory of the cores that it make gain a nice cosmos reference of the time. Where gods never change, they have a lots of things to do that we have no idea but their decision will impact directly in the destiny of the cores.