As a couple of extra points:

But now in this version Luke not only gives her a pep-talk, he gives her a new, fully functioning lightsaber, a new chance to fully embrace the Jedi. So now on Exegol the struggle is clear, recover the light or embrace the dark, and notice how she doesn’t use the new saber until she finally chooses to firmly stand against the dark as a Jedi. It’s almost like this is how it was always meant to be.

I just remembered it was decided to remove Luke’s line: “you will take both sabers to Exegol [because your pal Ben’s gonna need one]”. So now it could be interpreted as Luke giving Leia’s lightsaber to Rey as a replacement for the old, broken one. Rey doesn’t feel worthy of wielding this new saber, so she decides to take both sabers to Exegol, but continues using the old one. It isn’t until she fully rejects the dark that she finally reaches for and proudly wields Leia’s saber, and now the fact there’s an extra saber for Ben is just a nice bit of poetic luck.

Also if we carry this idea of focusing on the whispers throughout the film, it could give a new context to the implementation of Duel of the Fates, as now it could be seen as if the evil whispers have turned into a full blown choir as Rey has allowed herself to be consumed by her darkness until now… until now she has become the very thing she swore to destroy.