Wow, that's a really interesting point, and I'd never thought about it before. And it's true, too. James is like, the anti-David. Both were leaders, in a sense, but one only wanted to gather a team to serve himself, and the other served under Jake even as he lead his own people. David's life was ruined, James's life was improved. David considered morphing as a way to commit crimes and cheat the system, and James, too, found morphing to be a 'way out,' but in a bigger sense. There's tons of parallels.
And yeah, I agree that the Auxiliaries were handled very poorly. You could tell that KA probably had big, complex plans for them, what with the introductions and detailed characterizations they got in book #50. But after that, they got lost in all the noise of the final arc. It's a shame, since I would have really liked to have heard more about them after the war. You know, not even necessarily to have survived the war, just some acknowledgement of their sacrifice, and what it meant for them to have been Animorphs in the first place.