Was the Quran made by a single man? What can we make out of the 'patchworkness' of its texts? How was the Quran created?

The questions were asked in the comments by the viewers of videos of Odon & Jay, on Jay Smith Pfander Films YouTube channel.

https://thegreatsecretofislam.com/
Source:    • Odon#5: Qur'an = Patchwork made up of...