Asalamu Alykum Brothers and Sisters
I would like to also add a couple reminders.
First we DO note that the Quran was arranged and compiled in the lifetime of the Prophet[1]. Therefor as a believer I do believe that the Quran as we see it today is the
same as it was in the time of prophet Muhammad by way of God's protection. We do note that with the imperfections of man there has been some minor publishing errors/differences. Also as humans progressed there seems to be additional vowel dialects added to vowels to help with pronunciation to those of different languages. Otherwise its been protected orally and written in its chronological order.
Secondly we have to keep in mind that Muhammad had been inspired in different ways and in different capacities to do certain roles.
For example Muhammad would have been
inspired as a
Prophet which that inspiration would possibly have
aided him in his authority and duties over all his religious tasks
that were prescribed by the Quran, possibly the arrangements, when to revealed or deliver the verses to his people and so on.
Muhammad would also possibly had been inspired at a
messenger level. This may or may not been when to deliver the message, but also possibly in his duty as a leader, minister of affairs etc.
Muhammad would also possibly had been inspired at a
personal level. Take for example the inspiration people like the mother of Moses received. Compare that with verse 66:3
66:3 And [remember] when the Prophet confided to one of his wives a statement; and when she informed [another] of it and Allah showed it to him, he made known part of it and ignored a part. And when he informed her about it, she said, "Who told you this?" He said, "I was informed by the Knowing, the Acquainted."Muhammad would also possibly have recognized the differences between all his inspirations.
At the end of course Allah knows best
Salam
[1]Quran Compilation
http://quransmessage.com/articles/the%20compilation%20of%20the%20quran%20FM3.htm