Case: A building is constructed today. Someone asks: if Allah has always possessed power, why did the building not exist eternally?
Allah’s power is eternal, while the building is created and temporal. The eternity of the attribute of power does not entail the eternal existence of every object subject to that power. Nor does a new creature imply that Allah acquired a new capability.
The timing of creation cannot be used as a measure of the beginning or alteration of divine attributes. The perfection of the Creator and the dependence of creatures are distinct realities.