Well, I already pointed out that 21 Grams is not linear in the same way Watchmen is, but perhaps I wasn’t clear. Watchmen goes from Point A to Point F and hits B, C, D, and E on the way. Actually, it goes from whatever time the book starts on, to midnight, but it does it in a straight line. It’s the most basic, conventional narrative arc since a villain tied a damsel to the railway tracks in silent movies and we cut back and forth between the approaching train and the struggling maiden. Pulp Fiction has more to say about the impermanence of existence (with its structure that has Vincent Vega popping up again after he’s been shot) than Watchmen does.
However just a moment ago you said it was meaningful because the reader can skip ahead 20 pages if they like. Now you say it’s because you can’t change the next panel. But skipping from panel 6 on page 14 to panel 1 on page 27 is doing just that: changing the next panel for you, the reader.
And if this is now your analysis: that the consumer of the comic can no more change the next panel that Doc M can change his future, then how is that different from film, which in a cinema at least, is less flexible than a comic; you can’t skip ahead 10 scenes. And if this makes us understand Doc M then why doesn’t it make us understand all the other characters? Doc M’s story isn’t presented any differently than that of any other character.
Your point seems to be that Doc M experiences things happening simultaneously and therefore can only work in a comic because… I dunno? Because the story is all there in one piece in your hands? And you can jump to any part in it? Seems like a pretty tenuous link to me.