When asked about it at the time, John Ordover said that he wanted to shake things up. Also that he felt it was more effective narratively and aesthetically to have the start at the end. He must have liked that structure, because he used it again with Double Helix a few years later. *shrug*Working on the Day of Honor omnibus. Two books down so far... I do wonder what the HECK they were thinking in how they printed this. Next Gen, DS9, Voyager, THEN the original Trek novel that explains where the Day came from? Huh?
I'm surprised he never did a backwards crossover, that ran from Voyager back to the original series.