Also that World Champion quiz is bullshit, it counts the ECW title. That's the reason I only got 50...
RVD, Big Show, Vince McMahon and Bobby Lashley were all considered World Champions when they won the ECW title. When Morrison and Punk won it, the classification started to be a little shady. But when Chavo entered the Royal Rumble, they said he was the 1st World Champion since Hulk Hogan to enter the match. Then when Kane won it, WWE kept mentioning the fact that the Brothers of Destruction both held World titles. Plus, CM Punk had a whole feud with Kane about how he was going to cash in his World title contract on the ECW title.
If the ECW title ever "stopped" being a world title, it was probably when Mark Henry changed the belt. However, Matt Hardy always liked tooting his own horn saying he was the World Champion and talking about ECW as if it was a different company. Matt was weird.
Jack Swagger, Christian, Tommy Dreamer and Ezekiel were all the last champions. Tommy talked about the ECW title as if it was a World title when he was chasing it. And Christian said he was outraged that Edge didn't consider him when choosing his World title opponent for WrestleMania.
All in all, it really looks like the title was a World title. Having Ezekiel count as a World Champion is no different from The Great Khali. It is what it is.