So. I'm seeing a lot of little hints that Agatha's gonna get possessed by the Other.
I think the target is Gil.
Look at the very beginning, when Agatha uses a time portal to track Bangladesh Dupree, notice what Gilgamesh is wearing. Geisterdamen wraps. He looks post medical and we later knew the Geisterdamen have the procedures to overcome control by the Other.
Gilgamesh is going to take a hard turn, get rescued and then help Agatha with a historical event.
Methinks something the giant clank that the Von Zinzer's were crewing carried was found to be of extreme importance later as Gil was (eventually) upset Bang destroyed it. It was important enough time travel was necessary.