I work in intellectual property, though I am not a lawyer. If this person were my client I’d diplomatically tell them that they’re clean out of luck on this one. All the documents that come as a shock to the author are boiler plate NDA and work for hire arrangements, and outside of being a famous author who’s “brand” would bring something of marketing value to the table, at no point really would anyone be able to neg…
He did move on. He is at peace, finally.
He's the opposite of a diva and has humbly accepted that his reward for his work doesn't take monetary form.