Honestly I think you’re better off spelling it out for the audience. It’s like, if I showed this to someone who wasn’t an Uber-fan, I’d want them to be able to tell me at the end of the movie, “Oh yeah, the throne had the power to keep the bad guy alive, so Rey destroyed it!” I might be wrong though!
It’s interesting, I came up with the throne artifact idea only after ignoring the larger trilogy, characters, and themes of Star Wars and just looked at the stuff in this movie, so it may actually be easier for a non-fan to get it than someone who is looking for a deeper character or thematic meaning in everything. In a lot of ways this film is really a throwback to old fantasy and monster movies where the only thing that matters is in revealing the Vampire’s weakness to light or destroying Sauron’s ring.
Kylo: Show me.
Palpatine/Vader: Join me.
Ben: Grandfather.
Anakin: Palpatine lies!
Palpatine: I can give you…
Anakin: I brought you together.
Palpatine: everything…
Anakin: A dyad in the Force.
Palpatine: The Throne…
Anakin: Balance.
Palpatine: Power.
Shots of dark Rey and Kylo.
Anakin: No!!
I like this! And since Palpatine knows the term, it makes sense that Anakin knows it too. Though I assume Palpatine can hear Anakin and is fighting against him for Kylo’s attention, so it is a bit odd that he would act surprised that Kylo and Rey are a Dyad at the end of the film.