David Wood just posted these over at Answering Muslims. It is great to hear someone whose origins are from "the other side" of the divide confirming what we have been saying repeatedly in reference to this vital issue (i.e., he knows the Islamic sources from the inside though he is a convert). A full and complimentary study would be found in Gordon Nickel's vital work from 2011, Narratives of Tampering in the Earliest Commentaries on the Qur'an (Brill). The brightest and best of our opponents in the Islamic world need to start realizing that walking the path charted by Ibn Khazem which leads you to walk next to agnostics and skeptics like Bart Ehrman leads inevitably to the destruction of your own faith and text. It is grossly inconsistent with not only your world-view, but with the Qur'an as well!