It depends on how you have your settings set up in LDAP for what to do with users that are no longer on LDAP server.
Our LDAP server authenticates more than just Moodle users.
My intent is begin to prevent remove the users who no longer have a need to log into Moodle anymore and as it turns out, many of those have no need for Moodle anymore, by using a different subcontext on the LDAP server, containing only the users who need to log into Moodle.
I understand the hazards of just going in to delete users from Moodle, hence I have the word "backup" tattooed on my forehead. ( I get strange looks)
My main concern is that if they are a member of subcontexts A and B right now when they log into Moodle. I sync using subcontext A right now. All the members of subcontext B are members of Subcontext A.
I want to change the subcontext to B when someone logs in. Not everyone in subcontext B is a member of subcontext A. I want to make sure that the sameuser is not created from scratch.
Then remove those users who will now only be part of subcontext A. Backing up before of course.
I hope I did not thoroughly confuse everyone, I think I may be.