Regarding exile(HERMITCRAFT 10)

First of all, spoilers!

So, I just watched Grian's new hermitcraft video, where he sent Pearl, Cleo, Mumbo, and Joe to exile. Also himself by accident. And...it came to mind, why would Grian want to exile literally everybody? Does everyone have permits that weren't returned or accounted for? Or is this how Grian plans to end or restart the season?? I'm super confused on why Grian would want to do this, if someone could explain it that would be greatly appreciated.