Well if Wikipedia says it, that settles it.
Re: Wikipedia: Let me tell you a story.
There's a guitarist with enough albums out to have his own Wikipedia page. The page tells the story of the development of the guitarists career, who he associated with, when, what the names of the bands were that he associated with. I noticed that the article named just about every other guitar player he associated with, and when...except me. Even it was 37 years ago, people can't get the story right. So i took the liberty to edit the page to rectify what i knew about certain periods, making a reference to an un-named other guitar player, namely, me (worth a few laughs). While i didn't think my name was important, i did think the chronology and the associations were important. Still, the page perpetuates some strange fiction about how far back the current name of the band goes. It's really messed up, even while the subject is still alive and able to edit things himself.
Getting back to Mohammed, it's admitted that a lot of it was devoted to memory. If even for a few years, things can start to go south quickly. We are supposed to believe these people were good at memorizing whole books of great length. Already the tale is stretched. No, i don't believe anything the wiki article tells us.
A state actor, on the other hand, might have some influence on a wiki article, especially if there was a book published describing another, more plausible theory, on how the Koran came about. Given enough published books, a wiki article can be dominated.
I see the Koran as wholly concocted, barely hanging on a thread of a legend (Mohammed), designed as a weapon of war, a constitution, and a flag to be planted in the conquered territories. As such, you aren't necessarily going to have a clear picture of how it originated. Currently, we have something called a "backstory". That's all.