You must be registered for see images
What if Sakura one Sakura had a different boyish look, and fought Zabuza along with Kakashi and gained his blade as a present for defeating him, and being strong enough to wield it.
What if Zabuza threw haku under the bus, and told Sakura he considered her that she is his reincarnation, stating that she has something inside of her even more sinister and power than he does, Because this Sakura can project her inner Self Aura like Zabuza does/ only when Inner Sakura takes over.
And what is she had it during the chunnin exams, That would be overkill.