The way I read the quote about Glenn and the songwriting credit was that the success of the song more than paid Jackson back for giving Glenn a little credit. He said "we paid him back a little while later" which indicates to me he was talking about the Eagles as a group.

I did get tickled with him talking about he hadn't read enough books to be a good songwriter at first. I suspect his reading material at that time consisted mainly of car magazines and "other," non-parent approved items. LOL. He was a stoner, and I think I picked up a little sheepishness in his tone.