When the drive shaft is put through the hub and then torqued, it preloads the bearing.
This means that the hub assembly without the drive shaft can have some play even though the bearing is installed.
The inner race of the bearing is actually two pieces which are sandwiched, and the bearing seated together once drive shaft is torqued.
At least that's the case for my 05 aveo, yours should be the same.
Hope this helps