Indeed, I'd like to see my Muslim friends reject even more commentary from early Muslims, who were in a better position to know what really happened. Let's consider two passages in which Ubayy ibn Ka'b (one of Muhammad's most trusted reciters of the Qur'an) and Aisha (the "Mother of the Faithful") declare that approximately two-thirds of Surah 33 is missing. Both passages are taken from Abu Ubaid's Kitab Fada'il-al-Qur'an.
Ibn Abi Maryam related to us from Ibn Luhai'a from Abu'l-Aswad from Urwa b. az-Zubair from A'isha who said, "Surat al-Ahzab (xxxiii) used to be recited in the time of the Prophet with two hundred verses, but when Uthman wrote out the codices he was unable to procure more of it than there is in it today."
Isma'il b. Ibrahim and Isma'i b. Ja'far related to us from al-Mubarak b. Fadala from Asim b. Abi'n-Nujud from Zirr b. Hubaish who said--Ubai b. Ka'b said to me, "O Zirr, how many verses did you count (or how many verses did you read) in Surat al-Ahzab?" "Seventy-two or seventy-three," I answered. Said he, "Yet it used to be equal to Surat al-Baqara (ii), and we used to read in it the verse of Stoning."
I brought up Aisha's claim in a debate with Bassam, and Bassam, if I recall correctly, confidently proclaimed that the passage had been "fabricated." I hereby ask my friend Bassam to provide evidence that the Muslims in the chains I've presented were inventing false claims about the Qur'an. I would also like Bassam to say that Abu Ubaid (who was called "the ocean of knowledge" by his fellow Muslims) was ignorant and sloppy in his investigation of these passages.
(Note: If you ever wondered what happened to the "Verse of Stoning," which was supposed to be part of the Qur'an but instead came up missing, Ubayy ibn Ka'b says above that it fell out with the other 100+ missing verses of Surah 33).