I know Mr Cummins is a respected scholar in all things Pictish, but his circular logic on many things and jumping to conclusions left me infuriated. I don't believe he proved his theories to be any more credible than the ones he discredited. Too many gaps, too many unproven associations.
Although his theories are interesting I note he is listed on the back cover as a "former senior lecturer in geology at the University of Nottingham", not an archeologist or anthropologist, or even a professor of linguistics.
I believe there is still much to do in the way of research in this area and resist jumping to any conclusions in the matter until more has been done.
The connexion between various names and the symbols he is associating them with seem too pat, and without any tangible evidence, with no basis in culture or mythology or anything but convenience and numeric distribution of the occasions of usage of both. The only one which rang true was the possible use of mirror and comb to represent someone deceased, and then only because the cultural mythos of the connexion between the spirit and the mirror was brought into the discussion.