But your point is proven wrong if you look at the whole sentence: “We’ll always be with you, but this is your fight.” As in, she has to initiate the fight but they will help her when she does.
“but this is your fight” is not included in the video as I realized it is a contradiction for this edit. “We’ll always be with you.” works much better for foreshadowing than “A thousand generations live in you now, but this is your fight.” If it is Rey’s fight then why do ALL the Jedi show up at the end in spirit?