The second thing and the most important is tha The Quran my dear sir was not preserved by writing at all. It was preserved by memorization of thousands of people around the prophet muhammed .
Each day muslims pray 5 times in congregation in the mosque and the Quran is recited there in the prayer from memory . Never ever were the Quran principle means of preserving was writing , simply teh arabs were most of them illiterate but they had exceptional ability to memorize ( this is due to the cultrue of poetry they had ) .
They simply did that with the Quran . Scribes ofcourse wroote the Quran at the time of the prophet muhammed and later compiled it into one book after he died . if the Quran that teh scribes written was different from teh Quran that the thosuands of Companions memorized how on earth did they pray togeather ion teh mosque 5 times a day reciting different quorans , ?! there would have been quarells to high heavens .
Far from there being numerous huffaz who knew the whole Qur’an off by heart to the last letter, it was, in fact, so widely spread that some passages were only known to a few of the companions - in one case, only one.
**The meaning of the above statement of Hadhrat Zaid should now be very clear that among those who had written the verses under the direct command and supervision of Rasulullah (sallallahu alayhi wasallam), Khuzaimah was the only person from whom he (Zaid) found the last two verses of Surah Baraa-ah written. (Desai, The Quraan Unimpeachable, p.20). **
Although the hadith as recorded by al-Bukhari makes no mention of this, the statement that Abu Khuzaima alone had the last two verses of Surat at-Tauba (Bara’a) means that he was in fact the only one who had them in writing under Muhammad’s direct supervision.
In fact the text goes on to say that Abu Khuzaima was asked where they should be inserted in the Qur’an and he suggested they be added to the last part of the Qur’an to be revealed, namely the close of Surat at-Tauba (Bara’a in the text).
The verses were missed completely, they were only recalled and thereafter included upon Abu Khuzaimah’s initiative, and it was left to him to advise where they should be included.
The collection of the Qur’an by Zaid under Abu Bakr was a gathering together of the texts of the Qur’an from widely divergent sources and materials where the Qur’an was scattered, so divergent that at the Battle of Yamama some passages were irretrievably lost and, in another case, only one of Muhammad’s companions was aware of the text. “I searched for the Qur’an”, Zaid declared, indicating that he did not expect to find all the texts of the book in the memory of any one man or on written materials in any one place.
This type of source-material hardly supports the notion and claim that the Qur’an, as eventually collected, was perfect to the last dot and letter. The Muslim hypothesis is the product of wishful sentiment, it is not based on an objective and realistic assessment of the facts contained in the earliest historical records of the initial collection of the Qur’an.
The memory of men is fallible in view of such a long book as the Quran.
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