I know exactly where people got it from, it was from the first databook.I think it was a false DB translation or something like that which people started bandwagoning
This line right here:
He was a superior ninjutsu user, being able to use Water Release without being near the waterside, among many other feats.
What I have been trying to figure out for the last couple of years is, how on earth did people get "Best water user ever" from this?