Below is a preview of the album, or at least the album as it was (this is from some time ago.) It's very, very poor quality - but if you skip to 3:00, the song that starts up there, that absolutely sounds like it's Bono. Whether or not this is the opening to Skyscrapers (John Legend is never mentioned, only ever Kanye and Bono) I have no idea. Maybe there's more than one track with Bono, or maybe this one got sidelined.
Well, no, not 90%, but it's fair to say that a large % of people would find the suggestion that Bono shouldn't 'cheapen' himself by working with 'egotistical' people as pretty funny.