Before I begin, I would like to re-admit that I don't "get" Grant Morrison. I understand and, to some extent, can appreciate what others find interesting about his work, but for me reading Morrison is akin to arguing with someone who believes that, after death, we enter "the Supercontext ... a fifth-dimensional, informational continuum where things that we don't quite understand go on." (Because that's exactly what it is.) In other words, I don't disapprove of Morrison's grand scheme so much as I think its philosophical underpinnings are as sound and stable as those of anyone else who drops too much acid and claims communion with unseen entities of vast esoteric power. They—being the philosophical underpinnings, not the unseen entities of vast esoteric power—are there, certainly, but they're there to be accepted as revelation, not to be argued with.
That said, I decided to teach All-Star Superman anyway and will attempt to do it justice. Fortunately for me, that's not too difficult to do if I concentrate on the opening pages of the first issue. To wit: