[William Cloud Hicklin]

For events of the Third Age the LR and its appendices are really the only source, aside from the 'History of Galadriel and Celeborn' and the historical essays in UT. I noted in a thread a while back that in the (EE) death of Isildur PJ stuck with the LR account and avoided any part of the more detailed UT version.

Nobody's going to bother with de minimis borrowings, like the Ring of Barahir or the origin of Elves. Brief mentions can fly under the radar. Full narratives, on the other hand, based on elements of say Akallabeth which are manifestly not in the Appendices would pose a problem.

What I think is more likely is that PJ or whoever is going to concoct a near-total fiction involving the White Council and the Necromancer, which legally they can do. Dammit.