It's always dangerous for me to bring up languages since I'm not a linguist.
A lot of research into these matters is new, so researchers go on "gut instinct" often, and have to run from their academic superiors, depending on what school they teach in. And, of course, if they don't teach in a "name" school, they're ignored.
These matters of the origins of civilization seem self-evident to me; it's just a matter of waiting for the evidence to come in to maintain, or change, one's ideas.
Oops. Post #61 is for you too.