Wow! That was one useful post, Lori! Thanks for that. We often use lexiles here because it's about the only way I can tell what my son's reading level is. He resists reading comprehension tests, plus I don't like to do much of that sort of stuff anyway. It's really more for me than for him and his work, so it seems kind of self-indulgent. So knowing more about the lexiles and what they mean specifically is REALLY helpful!
I'm amazed that you found a specific explanation of the very book in question, too. Wowsa! Kudos to you!