Board Thread:Boruto Discussions/@comment-1926479-20180323224645/@comment-734582-20180326133759

Saboltgene wrote: all toad users in naruto were connected plus if kashin koji wasn't related to these users then they wouldn't have gave us hints about him being from konoha and they also wouldn't hide his face All toad users SO FAR are connected. When it comes to every other animal, we've seen many kinds of animals with no clear connection. Sasuke summoned a hawk with no connection to any kingdom. kakashi summons dogs, but they're different from Kiba's dogs. I don't find it a stretch to assume Kojin is unrelated to anyone else.

Secondly, they referenced Konoha because it's Kojin's region and so he took care of things there. The blimp crashed there, which is why Konohameru and Boruto went there in the first place. It's just story logic.

As to hiding his face, all ANBU hid their face without clear story connections. I don't see why he couldn't just do it as a visual thing.