Mubeen is something which is evident, which is apparent, which has no secret about it, which is clear and which is clarifying. So, in each situation where it is used, it has the same connotation. When it is used about Zulal, it means manifest error, which is apparent. One does not have to investigate whether that is wrong or right.
So, any error which is obvious and self-evident, that is called Mubeen. Amami Mubeen means a path which is apparent, which you do not have to search for. It’s just open before you. It’s for you, for the taking. So, that sort of meaning is imparted by the word Mubeen to the situation where it is used.