[Tirinvo]

Ai, but as to your first I answered as well. It would not only be in principle, but also irrefutably needed, as Tolkein never had the opportunity to smooth some of the more dibilitating wrinkles in his numerous "tales". It was not that he intended for any repetition or contradiction; it was that the notes in the Sil were scattered at best when Christopher compiled them. A prime example would be of the using of the name Legolas twice (once in LotR and FoG). If we would link the Sil to the BoLT, it would make the both stand more in credulousness from the passive reader.