Following on from the previous question, we can also ask why no descendant of the author has ever come forward.
The Book of Mormon is now one of the most translated and distributed books ever and it is certain that there would be a lot of money to be made by someone proving their ancestor was the actual author or co-author.
Where are all the claims of authorship? Wouldn’t a descendant of the author be able to make plenty of money from the publicity?
The fact that no descendant of the author has ever come forward is more evidence that no one was involved apart from Joseph.