Won't that kinda spoil it ahead of time?

It might be anyone who has touched someone else who has touched Aerith, but it can't just be anyone who has touched Aerith. That's way too few people to make sense. All of the Avalanche people can see them before they meet Aerith. Rufus can see them at the end.

So it could be that Cloud transfers it to all of them? I don't know if he touches every single one of them though?