I posted this question to reddit, but I figure I should put it here as well, as there is some technical lack of clarity.
The question is about what happens when you combine Sneak, Follow-The-Leader, and FollowTheLeader's auditory trait, with side reference to "quiet allies".
Question here: https://www.reddit.com/r/Pathfinder2e/comments/e1v9pl/sneaking_and_follow_t he_expert/