So one of the bigger questions I sort of thought of; from a practical non-ideological standpoint, was sundering the star really necessary?

A sundered Zodiark, with only 7 rejoinings (even when he had NO rejoinings at one point); was able to hold The Final Days at bay for over 12,000 years with no real sign of faltering in the slightest. Wouldn't it stand to reason that full power unsundered Zodiark could just hold Meteion's dynamis wave back for pretty much all of eternity? Making the sundering pretty much pointless for non-ideological reasons.