Board Thread:Consensus Track/@comment-1251315-20160407135539/@comment-7292165-20160410185438

@One Punch

The databooks are not over the manga. They are supplementary. Also, the databooks for the most part don't answer anything we don't already know from the manga except jutsu ranks, ranges, ages, heights, weights, and blood types, and other obvious things not revealed in the manga.

As for the natures. Just because a user wasn't seen using it doesn't mean they don't have it so it's not a contradiction. Unlike the databook not listing Danzo as a user of the Summoning Technique despite clearly using it to summon Baku.