Board Thread:Manga/@comment-26495049-20180831081518/@comment-7630054-20181128211825

While I'm sure Zeke must be dead for passing of power to happen (after all, first mindless Titans had to be created when Ymir was the only one around), the thing you're questioning might be a focal point how Ymir's power was split in the first place.

...also reading that made me think of ME3 "Control the Reapers" ending, only with Zeke's immaterial conciousness residing within and directing the Titans he created. Ouch.