ACL picker: what is the purpose of the site name for LDAP user?

What is the purpose of displaying the site name in the new GXT user picker for LDAP users? LDAP users are shared among all virtual sites. And when accessing to the same LDAP user from one site or the other, the site name is different and corresponds to the name of the current site.

So it looks like this column should be canceled or if it brings some values for Jahia users to initialize LDAP users with an empty value