So let's be generous and say there are eleven Disney worlds... you think there are going to be NINE original worlds? You think Disney would want their IPs overshadowed in quantity like that? There are TEN original worlds in Kingdom Hearts' entire history, and that's including stuff like the Mirage Arena and the End of the World.
I never even said that. I'm simply quoting what the article said. Who's to say that we'll even have 20 worlds? With the depth they're aiming for with the new worlds, I doubt there will even be that many. And even with a difference of two, how the hell does nine overshadow 11? Plus, KH is owned by Disney, what overshadowing is there to worry about?