While I agree with what you said about not "everyone" has to be "World Champion", I would look over the following statement you made in regard to the legends you listed that were "never" World Champions:
Mr. Pefect - Former AWA World Champion (Yes I know it wasn't the WWF World Title and AWA was on its way out, it still counts though)
Rick Rude - Former WCW International World Champion (Even though it wasn't the primary WCW World Title, it was represented by the Big Gold Belt, that counts as a World Title to me)
Ricky Steambaot - Former NWA World Champion (Like Rude his title was represented by the Big Gold Belt)
Just because these former WWF IC Champions/wrestling greats never won the WWF World Title, doesn't mean their title reigns in other organizations shouldn't be acknowledged.
Anyway, I think neither will be World Champion (or in Ziggler's case be champion again anytime soon) but things could change. With Orton suspended that can potentially change a lot of dynamics.