"PRINCE SEEROW!" FSSSSSSS"GET IN".
Seriously though, that's some clever thinking on your part. It makes sense. The Ellimist
is technically allowed to interfere at least once (much like in #7, #13, and AC) to warn against what is about to happen, especially when it affects an entire species (and in this case, it's the whole galaxy). However, what's to say that the Ellimist didn't already warn Seerow? Maybe the Ellimist
did show Prince Seerow what could happen with his choice, but Seerow, with being naive and willing to hope for the best in a species, went with his original choice anyway?
I don't think K.A ever considered your scene in the first place, but your entire ending rests on Seerow actually taking the Ellimist's warning and not giving the Yeerks Andalite technology. I'd like to think that even if K.A. wrote this particular scene in the book, Seerow would've still stuck to this beliefs and went with his choice anyway.
Besides, now that I think about it, I would've actually been a little disappointed if K.A. ended everything with a 'dream-ending'. It's one of the worst ways to end a story (a major no-no for many writers) because, ultimately, everything the characters would've done or gone through would've passed by without any sort of consequence, making it all pointless for the reader in the end.
I also don't like the fact that the main story would've just ended up as a (
really long) 'what-if' story than the actual canon non-existent one. It especially would've been disappointing for Animorphs since it ran for 6 years. I'd say most fans might even take that as a slap to the face. (But I do like that you thought up of this little loop hole. It was very clever, and it definitely has potential, but just not as the definite ending for a long-running series.)