The resurrection on the Last Day may also be described by the word iḥyāʾ (“giving life”). In this usage, it means that life which was concealed in the grave now becomes outwardly apparent.
In the grave: Life exists but is concealed from ordinary perception.
At the Gathering: That life becomes manifest as creation is raised.
Thus calling the Resurrection iḥyāʾ does not negate life in the grave.