Andrew has spent much time researching all manner of things but does that mean all manner of things have been researched? Mentioning swans comes from Andrew mentioning Cygnus and its relationship to ancient cultures and possibly the Giza pyramids...mentioning KAL extends to mentioning Kailasa and KAIL might just be an extended form of KAL, and they are both parts of ancient languages.
Mt Kailasa/Kailash is an important place for several important religions and is a site where two important gods swam as swans in a healthy lake right next to a dead lake. All kinds of things are important, and it matters whether all manner of things have been researched for Andrew's direction of where he wants to take the true origins of civilization.
We should never accept that the book the author has written is the last book to be written...because even such as you Madeleine, have info and a point of view that he might not have considered...that can bolster works and info and give greater validation to what he has thus far written in so many books and in info of research that he has accumulated and doesn't know what to do with.
The 220 pages we read in a book is from 850 pages of material...all that other stuff doesn't have enough evidence or info associated with it to print. Would KAL and a mountain and a tale about gods being swans be in those omitted pages?
Maybe we will find out in the next book...maybe this is his last book...we are chatting with an author...is he the most knowledgeable person amongst us all? Let's find out...