Board Thread:Manga/@comment-24407809-20160709015000/@comment-1784834-20160709034406

Here's an idea as to the resolution of the serum diemma:

Just as it seems the Survey Corp. is going to come to blows with each other, all of a sudden, comes the Dancing Titan, carrying a crate. Inside the crate is a whole batch of serum. The Survey Corp. comes to realize that Ymir was a TRIPLE-AGENT the whole time. After dropping it off, the Dancing Titan is tackled by the Beast Titan, calling her a traitor. The fight ends with Ymir ripped out of the Dancing Titan and fed to another Titan.

This Titan is cured and becomes a shifter. And who's the shifter?

It's Mikasa's mother, who had apparently been revived by Grisha using the Titan serum. Unfortunately for him, he was saving himself for Eren, and with no other suitable shifters, was forced to send her outside the walls.