Board Thread:General Discussion/@comment-9307023-20200720040859/@comment-44360626-20200816210841

In the first and second links it's outright stated that all the information came from Kubo. Even stuff like how Tokinada should be handled. And it directly states that the novels were not Narita's or Matsubara's ideas.

In the Bleach Jet links, the interviewer mentions that Nel and Harribel rule together in Can't fear your own world. Not only doesn't Kubo dispute this at any point, he instead answers what happens after the novels end in a way that makes it clear that for Kubo the events of the novels have happened.