My very unpopular opinion is that it is impossible to have anything without an intellectual thought from somebody. If Disney comes up with there own, who thought of it? Did a collective light bulb appear over headquarters because the entire company simultaneously came up with a new idea? Did whomever thought of it get paid for that idea to become a "property". Even a salary is payment. So, there is no such thing as an attraction that at one point isn't somebodies intellectual property either sold through salary or outright payment. Be their name Lucas or Joe Smith from Imagineering. My favorite saying... Much ado about nothing. If it's good and makes a good attraction, I don't give a rats behind who came up with it. It really doesn't matter at all. No corporation ever thought of anything by itself, it takes people and people can come from everywhere. That's how we get variety.