So to “finish” this concept of whispers is to have some of those whispers during Rey’s journey through the wreckage. She will need to have some guidance since there is no exact spot reveal now. Fortunately it’s a simple thing to add in. They can either get louder/more frequent/whatever as she gets close.

It’s also a good addition this route since how did try figure out how to get in the throne room exactly? It would have been so easy to get lost in there. Especially during the boat ride would get you a bit turned around and there was no guarantee of an opening right next to the throne room area.

So having those whispers while she is exploring/climbing also is a simple but effective way of being guided to it, again, relying on the dark side once again to make the struggle with the dark and light which kind of later reveals she may have gone through striking down Palps later in the movie if Ben wasn’t there.