The natural response is to say: "How could traditions this complicated and self-contradictory be pure inventions - they probably have some basis in partly-remembered events and persons."
However, in this case the earliest version is incredibly simple and straightforward - all the "convincing" intricate details sprung up out of nowhere 75-200 years later.
And the earliest version is incomprehensible in Muslim terms.
I haven't finished the book, but I'm wondering what the larger historical links are between the proto-Islam of the Syrian Uthman and the iconoclasm of the Syrian Konon (Byzantine Emperor Leo III).
http://en.wikipedia.org/wiki/Textual_criticism is very interesting, but we have to wait until it is possible to fill this article http://en.wikipedia.org/wiki/Textual_criticism_of_the_Quran with info ;-)