Si les spoilers ne font pas peur, voici une lettre « ouverte » écrite par les auteurs aux fans après la fin de la série, discutant justement de comment celle-ci se termine : https://www.hiracdelest.com/database/articles/kaa_response-full.htm

Voici la majorité du contenu, sans les spoils explicites :

Dear Animorphs Readers:

Quite a number of people seem to be annoyed by the final chapter in the Animorphs story. […] That there was no grand, final fight-to-end-all-fights. That there was no happy celebration. And everyone is mad about the cliffhanger ending.

Animorphs was always a war story. Wars don’t end happily. Not ever. Often relationships that were central during war, dissolve during peace. Some people who were brave and fearless in war are unable to handle peace, feel disconnected and confused. Other times people in war make the move to peace very easily. Always people die in wars. And always people are left shattered by the loss of loved ones.

That’s what happens, so that’s what I wrote. […] That doesn’t by any means cover everything that happens in a war, but it’s a start.

Here’s what doesn’t happen in war: there are no wondrous, climactic battles that leave the good guys standing tall and the bad guys lying in the dirt. Life isn’t a World Wrestling Federation Smackdown. Even the people who win a war, who survive and come out the other side with the conviction that they have done something brave and necessary, don’t do a lot of celebrating. There’s very little chanting of ‘we’re number one’ among people who’ve personally experienced war.

I’m just a writer, and my main goal was always to entertain. But I’ve never let Animorphs turn into just another painless video game version of war, and I wasn’t going to do it at the end. I’ve spent 60 books telling a strange, fanciful war story, sometimes very seriously, sometimes more tongue-in-cheek. I’ve written a lot of action and a lot of humor and a lot of sheer nonsense. But I have also, again and again, challenged readers to think about what they were reading. To think about the right and wrong, not just the who-beat-who. And to tell you the truth I’m a little shocked that so many readers seemed to believe I’d wrap it all up with a lot of high-fiving and backslapping. Wars very often end, sad to say, just as ours did: with a nearly seamless transition to another war.

So, you don’t like the way our little fictional war came out? […] Fine. Pretty soon you’ll all be of voting age, and of draft age. So when someone proposes a war, remember that even the most necessary wars, even the rare wars where the lines of good and evil are clear and clean, end with a lot of people dead, a lot of people crippled, and a lot of orphans, widows and grieving parents.

If you’re mad at me because that’s what you have to take away from Animorphs, too bad. I couldn’t have written it any other way and remained true to the respect I have always felt for Animorphs readers.

K.A. Applegate