I get that you guys are the ones with actual permission from the author to do this title, and that's really commendable, but the other person's work really highlighted some of the flaws in your chapters. I'm sure you know this already, but you could use some proofreading and better typesetting. Not trying to insult your hard work so far, but this seems like a great opportunity to improve your output and win back everyone's good will. I'm sure many people would be willing to help you, please consider it.
All the best, folks.