I was reading mygnr and read a quote from Slash:
Sweet Child O' Mine" was a joke. It was a fluke. I was sitting around making funny faces and acting like an idiot and played that riff. Izzy started playing the chords that I was playing, strumming them, and all of a sudden Axl really liked it. I hated that song because it was so stupid at first. I hated the guitar part. Now I really like it because I've gotten it to the point where it sounds really good when I play it live, and I'm so used to the song so I like it a lot more.
So, Slash created the riff while he was joking around, Izzy played it and Axl said "yeah this riff is gonna be on Sweet Child o' Mine"? I don't know, but this just makes sense. Slash created a riff and Axl said "this will be on AFD" or "this will not be on AFD". We don't know, but I always thought that Axl was the one who gave the final word. I know he's got the creative control on UYI, but... he had the creative control of the band even before it? Even on AFD? I really don't know, but now I'm pretty sure he's the one who made Sweet Child O' Mine that great.
Thoughts, please.
Axl probably liked what he heard and figured they could work with it, not "THAT riff you just played HAS to be on the album."