Your all wrong! Just because you get admin on GG and Pub and ZM doesn't mean you get it on WCS (at least not as of yet). They do not share the same admin list due to it being a fresh server. Not only that, but, e-mails get sent out telling people to put tags on their name. Yes, even before zero has time to add them to admin list (happened to me).

Yes, if he wasn't on admin list you had no way of knowing if he had admin or not. Its a clean temp ban.

My only suggestion is possibly kicking people a few times first till they realize that they should change something.