I'm pretty sure renegade (player with rating < 0) was "kicked off" his group ('and then belonged to grpnull), bfore this version.
Now, this player stays in his group (and can have the leader (new actual) icon displayed).
And , by the way, as every unit of a group knowsabout at max (4) other the units of this group, the knowsabout at renegade remains at 4 till the death!
Renegade should not belong to any group.