I've always wondered why all the aliens speak almost exclusively in English...it would have been so easy for Visser III to discover their identities.
Visser III, the Yeerk with the Andalite host, fights against six alleged Andalites...and they speak in English. It's weird. If he tried to speak in Andalite language, he would have realized that only one of the bandits was able to speak that language...
And when they are aboard the Blade ship? Visser III sends a public toughtspeak to dozens of Hork-Bajirs and Taxxons...in English!