Isildur’s “claim” to the Ring, like Bilbo and Gollum’s.

We don’t get weregild until Elrond’s say, and Boromir reveals he never heard the story, though doubtless both Denethor and Faramir did.

“But for the moment, since most of all you need to know how this thing came to you, and that will be tale enough, this is all that I will say. It was Gil-galad, Elven-king and Elendil of Westernesse who overthrew Sauron, though they themselves perished in the deed; and Isildur Elendil’s son cut the Ring from Sauron’s hand and took it for his own.”

Jackson’s rendition of Isildur here was superlative.

Except he had the right of weregild and the right of the spoils of war going to the victor would be enough

Interestingly (to me), I was watching a podcast about substance addiction recently and the speakers started discussing the phenomena of heavily addicted drug users compulsively lying about things which didn't matter. like lying about what they'd eaten for breakfast or which way they had walked home etc. I've been thinking about it so much since hearing that, and the Ring is such an elegant symbol of addiction, it's just that much more amazing that Tolkien had the insight to color ring possession with some essence of that compulsive lying. Really comprehensive, finely attuned awareness of the dynamics of addiction throughout the series. Truly wise, insightful writing.

Congratulations on getting the connection by yourself! I don't know how many read-throughs I would've needed to catch it, but I heard about this connection in one of Corey Olsen's classes.