There really wasn't long between Forerunner and this, its sequel. I suppose prolific authors, having so much more to remember, can be forgiven for minor failures of continuity. In this case, however, it's something of a doozy. In Forerunner, there's no doubt that Simsa has retractable claws. It's pertinent to the plot, and has impacts several places. In this book, she regrets the lack of claws (to aid in climbing, for example). So what happened? Surely she wasn't declawed?
I'm not sure why this book is shoehorned into a series in the citation, btw. The simple use of the common word Forerunner, (even in the title) doesn't establish any necessary linkage. These two books can stand alone, despite many elements in common with other books, though there's room for a third book, if necessary.
Note that the education the Burrowers and other poor children in and around Kuxortal is frankly abusive, involving repeated beatings. If the children AREN'T naturally inquisitive, there's very little likelihood of then learning anything.