I am really curious where this arc is going.
I definitely think we need to see outside events soon, especially if Shamrock got called back and Mariejoa is on fire. If I had to guess, Imu is on the verge of being exposed by the Revolutionaries and their invasion.
What Im more curious about is how this Gunko situation gets resolved. Clearly somehow Brook's relationship to her will factor how Imu gets expelled from her body or how she makes a sacrifice play, but does that imply that the arc stops there?
I do really think that the Revolutionary/GK conflict will end up pooling over to Elbaf, somehow, between the ability for GKs to be summoned virtually anywhere like Gorosei, and Dragon and at least Karasu's ability to fly/appear where they want.
Im just hoping Elbaf becomes bigger than a conflict of kidnapping children lol, there are so many ways this arc can resolve key storylines