Thank you for taking an interest in my book, I hope you enjoy it!
I was not aware of the work of Tilak. His book "Arctic Home in the Vedas" looked so interesting that I got it for my Kindle!
I am convinced that the common origins of the human civilization go back at least to 40.000 BC, as I write in the following article on my blog: [ourunknownancientpast.blogspot.com]
It also appears that, as you say, human migrations were much more frequent than believed by scientists, forming very complicated flows. I understand why scientists need to have a simple migration model, but it is simply not realistic.