Still reading that book I see.
Does a Harry Potter book provide anymore evidence of the "flobberworm"? It's mentioned in the book, so it MUST be exist.
It's not a book; it is a research paper.
Research papers set forth theories all the time; they do so by analyzing facts within an objective framework.
If you have a better theory than what Cunningham has proposed, then I am eager to hear it! Assuming, of course, you have already read and thought through his critiques of the competing theories...
I WILL wait for you to do your research. A lot of important theories were published in books and research papers, that does not mean that they are all right, it just means that we should not wish them away!