Comicwalker release accidentally put the non-canon warning the SCoOW doujins have on the chapter (they all release at the same time under Strange Creators of Outer World along with this manga, hence the mistake), it's been removed since, the manga is still canon.
It was also on niconico but...
Hina mentioned in an earlier chapter that she was "somewhat of a leader figure" so its essentially official
ZUN's pretty much made it so that the kappa (and yamawaro, Takane was also said to be a leader figure) power structure isn't as rigid as the tengu and the tanuki, so they aren't the...