Because it doesn't make sense for Universal to tell a creative person they want to work with they want to drop one of the things they had planned on doing for something else, but still use him to promote the event with the other thing they had planned, especially since the thing the wanna drop is more valuable.How so? If you have a maze and zone, dropping the maze for another could be a choice that universal made. Of course i imagine it would take a lot of convincing him. Besides, it was only an idea, if it had to be an IP dropped.