[The Squatter of Amon Rûdh]

It's just his writing style. Christopher Tolkien has been attempting a very ambitious piece of literary archaeology with the Histories, and this has necessarily been conducted and presented in an academic fashion. The footnotes and obscure connections are a result of the incredibly disordered and fragmentary state of the Professor's notes at the time of his death and his editor's attempts to leave out as little as possible. Anthropological studies of natural myths take much the same approach to their material.