What the fuck is the deal with the WBA?

Why is it necessary to study for hours to get their championship system? http://www.wbaonline.com/wchampionships/Champions/champions.htm They have divisions with only one champion, but they have no label. Some divisions have two champions, a super champion (which they call unified, kind of strange considering there is another WBA title in the divsion), and the regular champion, that they just call the WBA champion. Lightweight has Juan Diaz as the "undisputed WBA champion." What the hell is the difference between Diaz's title and any other titlists title that doesn't have a regular belt floating around? Okay, I'm done with the rant, so now my questions. 1. When and why do they make a regular champion in a division? 2. What is the difference between an interim WBA title and a regular WBA title? 3. How the hell did Juan Diaz get the undisputed label, while no other current champion has been able to get it?