Returns the the lead group for the given group.
The order in which the lead group is determined is as follows:
|Return Value:||Group - Group that is the leader for the given group (or the group itself, if no lead is group defined)|
_subGrps = leaderSG (group player)
For the example above, the following values are returned:
|See also:||selectLeaderSG, leaderGroup, leader|