Suppose a body first occupies a location with no preceding occupation. What earlier state is being compared with the present kawn? This raises a subtle question about the definitions of motion and rest.
Movement as defined refers to a previous occupation elsewhere; rest refers to a previous occupation at the same place. If there is no prior occupation at all, classifying the first state under either heading cannot be accomplished merely by repeating the definitions.
The objection does not make motion or rest meaningless. It questions whether every possible occupation has been demonstrated to belong to one of the two categories.