I think they're saving the Kingsmoot subplot for next season, although I can see them cutting down a lot of the filler involved (Everything involved with Aeron, the subtle differences between the Ironborn families, etc.). I have a feeling we'll see Balon bite it during the season finale to set up Yara/Asha for next…

Strangest theory I've heard was the Daario = Euron one. While their timelines match up (kind of) it still seems a bit ludicrous.