Regarding Part 1 of the review: I've never gone from serious goosebumps to laughing so fast in my life! Nice work with the Fresh Prince parody. Also I really enjoyed your suggestion of how the Ellimist could have told his story, would have been a lot more fun.
I was never a big fan of this book either. Again not like I dislike it, but so much more could have been done with it. Not to mention certain parts were a bit confusing, especially way back when I first read it.
I was never that interested in the idea of a Taxxon Chronicles, we got given a bunch of their background in the Andalite Chronicles. The Chee Chronicles would have been amazing though. You could show their home being invaded, looking for a new home, finding Earth and infusing the Pemalites essence into wolves, and some of the Chee's history on Earth and events they might have influenced. I never even considered an Anati Chronicles, but that would have been interesting too.
Also I'm totally on board with a well done Animorphs/Doctor Who crossover