You may have been misled with regards to pp455/6, as my copy of the book has only 442 pages.
Page 162 line 17, however, does include a Duncan, details as follows:
b1. Donald, who had at least four sons - Christoper; Duncan; Allan; John.
Donald's parents were Duncan, who was living at Achantighard in 1756, and Isabel, daughter of Maurice MacRae. In turn, Duncan was son of Donald who married Ann Matheson of Fernaig, and whose parents were Alexander, son of the Rev. Donald, who settled by his father in the lands of Drugaid and is said to have married a daughter of Fraser of Belladrum.
I hope this is of use to you.
Reply posted by : Jon McRae