User blog comment:B214/Volume 22 spoilers/@comment-73.46.6.122-20160906202532/@comment-9595671-20160908142145

Season 3 had help from Ishibumi, and despite how things went they did make one notable appearance during the first episode.

So who knows, considering how popular they've gotten to some people, Ishibumi could surprise us there. If something in a series gets big enough, often the author may make an addition.