Listened to
Mark Waid's interview in WordBalloon. Half of it is him bashing Roy Thomas for pushing to be credited as the co-creator of Wolverine despite him being the editor (lol).
In the other half he says he left Shazam because he knew Dan Mora was gonna leave to do Absolute Power and he didn't want to be known as the guy who got the book cancelled at #12 without Mora. It kinda sounded like he regretted it.
About Absolute Power (and this is the wild part): he says the pitch came from editorial and says that Zdarsky "had been tinkering with it" and at different points Snyder, King and Taylor had taken shots at doing it but "couldn't wrestle it to the ground". On a more positive side, he says Mora's art rivals George Perez's.