Note that in WZ 3.2+, any type of game object can be added to a group.
3.2
groupID
Number
The ID of the group
3.2
groupSize
Number
The size of the group after the object was removed from the group.
3.2
Notes
An object can be removed from a group in four ways:
The object is moved to another group
The object gets destroyed
The object is transferred to an ally
The object is assimilated by Nexus Link
The sequence of events is as shown below:
When an object is transferred or assimilated, the .player property of the object sent to eventGroupLoss() will be the original player, whereas the .player property of the object sent to eventObjectTransfer() will be the new owner.
When droids are assimilated via Nexus Link, eventDestroyed() is also triggered, however this is considered to be a bug as the object hasn't actually been destroyed.
Thanks to NoQ for providing detailed information on event sequencing.