Did she know something like this would happen?
And finally, to add onto this idea about time being connected to her kagune implantation, Sasaki is desperately searching for her, and becomes infuriated when he can’t find her. And in this panel, we see him counting down days on a calendar. We also see that the scaling on his hand extends up his arm, past his elbow, far past where his arm was severed.
Is his arm worsening? Has he realized that there is some kind of limit? Is that why he’s focused on finding her himself, without telling the CCG about the information he has on her?
tl;dr: What if a side effect of Eto’s kagune implantation is a time limit on the person, forcing them to return to Eto to minimize or postpone any ill effects? And what if this is the case with Sasaki, providing Eto with a physical tie to him in order to force him into the role she wants for him – the role of the One-Eyed King, the half ghoul who will change the world?