User blog comment:B214/Volume 22 spoilers/@comment-9595671-20160814045836/@comment-9595671-20160814054925

While I don't doubt some information from EX is canon such as the Seven Satan system, I don't think everything in it is enough to prove what'll happen next.

Especially as I haven't seen Ishibumi say anything that implies that everything in EX is already set in stone (If there is feel free to point me towards it), I doubt he wants to end up giving away how the series ends yet.

Or Rizevim pulled the same trick on them, and possibly others considering the guy was crazy enough to do so many things that seemed insane to even try.