[Samba] Need help understanding smbldap-tools and user records

[Jim]

Don't know if this got sent properly the first time so I am resending.

Why is it that when I use "/usr/share/samba/scripts/smbldap-userad.pl -a 
Administrator -g dadm" that the group doesn't get changed to dadm? 
Instead it stays set to the value specified in $_defaultUserGid.  Also, 
I must say that I find the default of *not* adding a group for the user 
very counter-intuitive.

What exactly is the difference between gidNumber and primaryGroupID in a 
users record?

Jim C.