[mhagain]

It occurs to me that the First Age stuff is easily solved. There's enough material in the LotR Appendices to form an outline that can be usable as a prologue, and then all that needs to be done is show some non-specific scenes of Elves and Men in combat. So we could very easily be shown, say, Finrod in combat (at one of the earlier battles), together with a voiceover that just says he died but without explaining how. Fingolfin and Fingon don't actually appear in the Appendices, not even by name. Turgon does but only as a fleeting reference. Of all the First Age Elven Kings, Finrod is the one with most information about him, and we're told he was King of Nargothrond, brother of Galadriel, and gave his life to save Beren (but nothing more specific).


There's also the matter of Gildor Inglorion, with Inglorion meaning "son of Inglor", and Inglor being an earlier name for Finrod from first edition times, but that's probably best kept away from.


For the Second Age, the biggest hole is, as I've said, the story of Celebrimbor. The material in LotR is so thin as to be virtually non-existent, and even if the show can supplement it with the Silmarillion it's barely better. They absolutely need Unfinished Tales for this, particularly if they need to present it in a matter that doesn't contradict Unfinished Tales. Doing a story of Celebrimbor without UT, but also without contradicting UT, would be absurd, and the only solution would be to put the whole matter of the Rings creation and theft by Sauron behind the scenes. Which would also be absurd for a show named "Rings of Power".


On that basis I refuse to believe that the show doesn't have this material, but I guess we'll see.


Everything else seems adequately covered. Númenor, on a quick glance through LotR and comparison with Akallabeth, is very well-covered, but it would, I agree, be a shame to lose the Miriel story. Galadriel is very thinly-covered again, but there's no real detail there anyway, which would free the show up to invent things. Lindon, more or less likewise. And so with pretty much everything else.


If I were to fan-theory about the timeline compression, something that might work might be placing Sauron's capture and imprisonment in Númenor directly after the Númenoreans rout Sauron from Eriador. In other words, a merging of Tar Minastir and Ar Pharazon. There's not a huge amount of info in the Tale of Years (or any other source, barring the Númenorean king list) for the gap between the two anyway, so that should be very doable.