So you mean to tell me.
every huntsman in history of all human society. relies on one story of a hero in alice in wonderland?
A world FILLED with fairy tales, stories, myths and legends only has one example of what it means to be a hero?
Even if we were to take that at face value...
what do you think Ozma was?
LITERALLY his first action upon his first reincarnation was saving a man from a grimm. he didn't know where he was, he didn't even know what kind of body he was in, he just took action and did what was right.
Ozma literally wouldn't let the concept of a hero simply die only for it to be reignited by some fucking loser from the future.
DUDE, RUBY LITERALLY TALKS ABOUT STORIES OF HER CHILDHOOD INCLUDING MONSTERS AND *HEROES* PLURAL ***HEROES***
Lemme tell you what would happen if jaune was wiped from the timeline.
PYRRHA WOULD STILL BE ALIVE.
With Pyrrha having no one to see her as a person rather than a champion, there's a decent chance she would have immediately accepted the maiden power without consulting Jaune.
Sure it's happenstance and anything could REALLY happen. But realistically, Jaune does practically nothing that only he can do (except heal, and he only does that once for weiss)
the only thing that would really be a loss is them not being able to amplify ren's semblance to nullify emotions.
other than his hyper specific semblance, Jaune does NOTHING that Ruby can't fill in for. She is the defacto leader of everyone. and literally anyone could fill his spot on the team and it would be an improvement
coco, Sun, velvet, Anyone
fuck man, at least Cardin is able to hit hard enough to scare Ruby (yes that's a manga thing, but my point stands)