The Quran (Koran) was supposedly "revealed to Muhammad, starting one night during the month of Ramadan in 610 AD, when he, at the age of forty, received the first revelation from the angel Gabriel, who had given him the responsibility for inscribing these messages from the Islamic God to give to mankind.
Muslim scholars believe that prophet Muhammad was illiterate, as mentioned in the Quran itself:
"Those who follow the messenger, the Prophet who can neither read nor write, whom they will find described in the Torah and the Gospel (which are) with them......"Quran 7:157."
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No doubt fingerprints of Jews are somewhere to be found.
No matter who's fingerprints are on the fragments, if it can be proven similar scriptures (fragments) existed prior to Mohammed's version of the Koran (by whatever dating means), it creates a quandary - since Mohammed said he received it from the "Angel Gabriel". What a stinker if he actually plagiarized it from someone else. And this could explain why there was much activity shortly after to destroy all manuscripts except for the "one true copy" of course!
More details here from Wikipedia: History of the Quran
Yes, Mohammed is said to have received the text of the Koran by revelation from Gabriel over a period of time.
The best explanation I’ve read is that the Koran is likened to the Christian belief in Christ as always existing. Think Christ as the Logos. Muhammed may have received revelation but the Koran, as the word of Allah, is believed to be eternal and preexisted it’s revelation to Mad Mo. In that same analogy, Mo is likened to Mary giving birth to the preexistent Christ.
Of course there’s always a minority Shia accounts of Mo reviewing the text of the Koran with Ali. I haven’t bothered to read much about it, only enough to be amused by it.
Given the belief in the preexistent Koran, any versions proven to predate the official historical account will no doubt be explained away.