Oh, Erek's time on Earth I'd agree completely. That's a book, right there.
But the Howler invasion? It's just a couple of weeks/months of Howlers slaying millions of Pemalites in any creative way they can think of, and the Pemalites finally deciding "hey, let's leave". Then bundling all of their pet robots into a ship and flying away. Oops, they used a bio-bomb on us before we left. *cough splurt die*
That's it. That's the entire story on the Pemalite planet. There's nothing else there, and we already know how it happened.
But Erek's escapades on Earth? Sure, that's a Chronicles book. Just nothing before they landed.