Okay, let me just give you an analogy on how I see SDOIT:
Imagine a painter paints this big collage which consists of, let's say 9 different paintings which all come together to form the bigger picture, one big piece of art that cohesively flows together and makes a grand statement.
Then, once that initial exhibition is done, that artist starts to display each piece of that collage separately here and there. Sometimes two at a time, sometimes one, sometimes the whole thing again.
At the point where he starts doing that, each piece of the collage becomes its own painting, and is subject to being experienced and analyzed on its own merits rather than as a part of the greater whole. And critics, or just art enthusiasts can easily say, "Well, my favorite of this artist's paintings is Solitary Shell (for example)."
That's how I see SDOIT. Yes, it was created as one piece, and presented as such on the album. But as soon as they started releasing and performing bits and pieces of it separately, they fragmented it into bits that can easily be considered separate songs.