Were the remaining seven Quranic letters neutralized when the Quran was compiled according to the Quraysh dialect? And are the continuous recitations (Qira'at Mutawatirah) and narrations (Riwayat) independent scholarly interpretations by the reciters and narrators, or are they the word of Allah?

Scholars have differed regarding the meaning of the seven ahruf (modes/letters) in which the Quran was revealed, but they have agreed that they are not the commonly known seven qira'at (readings). Uthman's unification of the Ummah upon a single harf (mode/letter) was by Allah's grace to prevent discord, and he did not cause any part of the revelation to be lost. For each of the seven ahruf is sufficient and complete, as stated in the hadith. The companions saw that unifying the reading was necessary to ward off fitnah (strife) and discord, and this was a concession, not an obligation. The qira'at and their manner of performance are not personal interpretations, but rather are received orally through an unbroken chain of transmission back to the Prophet (peace be upon him). Scholars selected imams well-known for their mastery and precision from every region to facilitate memorization and ensure accurate transmission, and among them were the well-known seven qurra' (readers).