BK,
Perhaps I missed an earlier posting, but:
I don't quite understand what the issue is with your new book.
Walt Disney is dead. He was a public figure.
You can't copyright a title.
In my THE HOLLYWOOD LEGENDS plays, I write about/dramatize many deceased public figures. I've been doing it since the early 1980s. I've even discussed the issue with lawyers. They told me not to worry.
And, I've never had a problem.
Fingers crossed.