Hal 9000 said:
Yeah, I don’t know though. If a thousand generations live in her and she’s trying to commune with past Jedi, I guess it’d have to be more than like four guys.
I’m not sure what the canon explanation will end up being, though.
My guess is simply that the voices are not Force ghosts. We never see Luke have to struggle to speak with Ben or Yoda. Rey’s attempting to commune with those who have become one with the Force, whether they’ve achieved “immortality” or not.
I will say, I don’t like including this in the crawl. The crawl is an opportunity to include information not in the film itself and frame the story in the way you choose. When we meet Rey, we learn she’s trying to contact the past Jedi (so putting it in the crawl is redundant and a missed opportunity). But why is she trying to contact them? The why is what should be in the crawl.