Nope, they needed nothing, because it was in the 7th c. Iraq. After, they elaborate the core story, they continued to do so. Thusn they had in the 9th c. a perfect story which of course, with some arrangement " explain some verses that they didn't understand at all because they weren't involved in the birth of the Quran".
It was then deducted by the Arabs literati that the word "muhammad" was the Arab to whom God is speaking. They made a link between the two informations. Like all normal people. Muslim literati have scanned every word, allusion and has elaborate narratives biased of course but it is religion and an Arab "prophet" for Arab, like Moses, etc.
Sorry, I am confused and not sure to properly understand what you are saying, so let me summarize/ask questions :
1) Quranics texts were being circulated in the 7th c. You seem to imply neither the arab chiefs nor the literati had anything to do with that so whether writing them nor distributing them. Is this right ?
2) You also seem to imply that those literari started to tell the arab chiefs that those texts did mention an arab prophet. Is this right ?
3) You seem to imply that those literari started to tell stories about this arab prophet to those arab chiefs. Is this right ?
If your reply is yes to all 3 questions or at least to the last one, then I don't understand how they could have sold a leading prophet to the arab chiefs who knew this was totally fake and didn't care about him (no prophet is mentionned from Muawiya in the different archeological items that he left behind him).
But I might have totally misunderstood your thesis.
This sentence is totally non understandable for me
As in fact, they
(the literati ) do not understand the Quran, it means that it not comes from them. Therefore he should have come from scribes and
literati,
Muhammad Hanifiyya has wrote the Quran?
No he didn't. The Quran is not the work of a single man, and some of the texts date from centuries before.
For me, the Quran, Muhammad, the caliphs are 3 different items that came together to give birth to islam as we know it today but they had no link between each other at the beginning.