The Clan Donald book is a great source for those that are directly descended from Clan Chiefs. But therein lies the greatest weakness of the same book as a source.
And the same for articles like:
https://highcouncilofclandonald.com/magazine/the-macdonalds-of-kinlochmoidart/
Because the great majority of us are not descended from the clan chiefs, we are the "ordinary" clan folk.
And "chief" ancestry can easily be confused by the same name frequently reoccuring across many families and generations.
It's not easy 
No wonder we need the Uisge Beatha.
